18 letter words, grouped by first letter

  • absentmindednesses
  • accumulativenesses
  • adenocarcinomatous
  • advantageousnesses
  • aerothermodynamics
  • agammaglobulinemia
  • agammaglobulinemic
  • anagrammatizations
  • angiocardiographic
  • anthropocentricity
  • anthropomorphizing
  • antiadministration
  • anticholinesterase
  • anticommercialisms
  • anticounterfeiting
  • antidiscrimination
  • antiferromagnetism
  • antivivisectionist
  • appreciativenesses
  • apprehensivenesses
  • archaeoastronomies
  • astrophotographers
  • astrophotographies
  • australopithecines
  • autobiographically

  • bacteriorhodopsins
  • biocompatibilities
  • biodegradabilities
  • biotransformations
  • bloodthirstinesses
  • bourgeoisification
  • bureaucratizations

  • cantankerousnesses
  • characteristically
  • chemiluminescences
  • chlorofluorocarbon
  • chlortetracyclines
  • cholecystectomized
  • chromolithographed
  • chromolithographer
  • chromolithographic
  • claustrophobically
  • coccidioidomycoses
  • coccidioidomycosis
  • collectivistically
  • commensurabilities
  • commercializations
  • communicablenesses
  • companionabilities
  • compartmentalising
  • compartmentalizing
  • comprehensibleness
  • conceptualizations
  • congregationalisms
  • congregationalists
  • consequentialities
  • conservativenesses
  • constitutionalisms
  • constitutionalists
  • constitutionalized
  • constitutionalizes
  • constructivenesses
  • consubstantiations
  • contemptiblenesses
  • contemptuousnesses
  • contradistinctions
  • conversationalists
  • counteraccusations
  • counteradaptations
  • counteradvertising
  • counteraggressions
  • counterconventions
  • counterculturalism
  • counterdemonstrate
  • counterdeployments
  • countereducational
  • countergovernments
  • counterinfluencing
  • counterinstitution
  • counterintuitively
  • counterpetitioning
  • counterprogramming
  • counterpropagandas
  • counterquestioning
  • counterreformation
  • counterretaliation
  • counterrevolutions
  • counterstrategists
  • countersuggestions
  • creditworthinesses
  • curmudgeonlinesses

  • deconstructionists
  • decriminalizations
  • dedifferentiations
  • dehydrochlorinases
  • dehydrochlorinated
  • dehydrochlorinates
  • deinstitutionalize
  • deliberativenesses
  • dematerializations
  • demythologizations
  • denationalizations
  • dendrochronologies
  • dendrochronologist
  • denominationalisms
  • deoxyribonucleases
  • depersonalizations
  • dephosphorylations
  • determinablenesses
  • dextroamphetamines
  • diastereoisomerism
  • diethylcarbamazine
  • diethylstilbestrol
  • dihydroergotamines
  • dimethylhydrazines
  • dimethyltryptamine
  • diphenylhydantoins
  • disagreeablenesses
  • disconnectednesses
  • disconsolatenesses
  • discontentednesses
  • discourteousnesses
  • discriminabilities
  • disenfranchisement
  • dishonorablenesses
  • disingenuousnesses
  • disintermediations
  • disproportionately
  • disproportionating
  • disproportionation
  • disputatiousnesses
  • disreputablenesses
  • distinguishability

  • echocardiographers
  • echocardiographies
  • electrocardiograms
  • electrocardiograph
  • electrochemistries
  • electrocorticogram
  • electrodepositions
  • electrodesiccation
  • electrodynamometer
  • electroluminescent
  • electromyographies
  • electrooculography
  • electrophilicities
  • electrophoretogram
  • electrophotography
  • electrophysiologic
  • electroretinograms
  • electroretinograph
  • entrepreneurialism
  • epithelializations
  • establishmentarian
  • ethnomethodologies
  • ethnomethodologist
  • ethnomusicological
  • ethnomusicologists
  • evapotranspiration
  • exceptionabilities
  • expressionlessness
  • extemporaneousness
  • exterritorialities

  • faintheartednesses
  • feeblemindednesses
  • ferroelectricities
  • forethoughtfulness
  • fractionalizations

  • gastroenterologies
  • gastroenterologist
  • gedankenexperiment
  • generalizabilities
  • geochronologically
  • glomerulonephritis
  • glottochronologies
  • glycosaminoglycans
  • granulocytopoieses
  • granulocytopoiesis
  • greatheartednesses

  • handcraftsmanships
  • heavyheartednesses
  • hemidemisemiquaver
  • hemoglobinopathies
  • histocompatibility
  • histophysiological
  • homoscedasticities
  • hydroelectricities
  • hydrometallurgical
  • hydrometallurgists
  • hydrometeorologies
  • hydrometeorologist
  • hydroxytryptamines
  • hyperalimentations
  • hypercoagulability
  • hyperconcentration
  • hyperconsciousness
  • hypercorrectnesses
  • hyperimmunizations
  • hypernationalistic
  • hyperpigmentations
  • hyperpolarizations
  • hyperrationalities
  • hypersensitiveness
  • hypersensitivities
  • hypersensitization
  • hypoparathyroidism
  • hypophysectomizing
  • hyposensitizations

  • immeasurablenesses
  • immunocytochemical
  • immunodeficiencies
  • immunofluorescence
  • immunohematologies
  • immunohematologist
  • immunopathological
  • immunopathologists
  • immunoprecipitated
  • immunoprecipitates
  • immunoreactivities
  • immunosuppressants
  • immunosuppressions
  • imperceptivenesses
  • imperishablenesses
  • impermissibilities
  • impersonalizations
  • imperturbabilities
  • impracticabilities
  • inappreciativeness
  • inarticulatenesses
  • inauspiciousnesses
  • incombustibilities
  • incommensurability
  • incommodiousnesses
  • inconceivabilities
  • inconclusivenesses
  • inconsequentiality
  • inconsiderableness
  • inconsolablenesses
  • incontestabilities
  • inconvertibilities
  • incorrigiblenesses
  • incorruptibilities
  • indefatigabilities
  • indestructibleness
  • indiscriminateness
  • indiscriminatingly
  • indispensabilities
  • indisputablenesses
  • indissolublenesses
  • individualizations
  • industrializations
  • inexhaustibilities
  • inexplicablenesses
  • inexpressibilities
  • inexpressivenesses
  • inexpugnablenesses
  • inharmoniousnesses
  • inhospitablenesses
  • institutionalising
  • institutionalizing
  • insubstantialities
  • insufferablenesses
  • insusceptibilities
  • intellectualnesses
  • intelligiblenesses
  • interchangeability
  • intercolumniations
  • intercommunicating
  • intercommunication
  • interconnectedness
  • interinstitutional
  • intermediatenesses
  • interminablenesses
  • internationalising
  • internationalities
  • internationalizing
  • interoperabilities
  • interpretabilities
  • interrelatednesses
  • interrelationships
  • intersubstitutable
  • intransitivenesses
  • intraventricularly
  • introspectionistic
  • invulnerablenesses
  • irreconcilableness
  • irremediablenesses
  • irreplaceabilities
  • irrepressibilities
  • irreproachableness
  • irresistiblenesses
  • irresponsibilities
  • irresponsivenesses
  • irretrievabilities

  • knowledgeabilities

  • landlubberlinesses
  • largeheartednesses
  • latitudinarianisms
  • lepidopterological
  • lepidopterologists
  • lightheartednesses
  • lipopolysaccharide
  • lumpenproletariats
  • lymphangiographies

  • macroglobulinemias
  • macrophotographies
  • magnetoresistances
  • magnetostrictively
  • maladministrations
  • malcontentednesses
  • manipulativenesses
  • mechanochemistries
  • melodramatizations
  • meretriciousnesses
  • metallographically
  • methemoglobinemias
  • methylcholanthrene
  • methylnaphthalenes
  • methylprednisolone
  • microcalorimetries
  • microcrystallinity
  • microdensitometers
  • microdensitometric
  • microencapsulating
  • microencapsulation
  • microenvironmental
  • microlepidopterous
  • micromanipulations
  • micrometeorologies
  • micrometeorologist
  • micromorphological
  • micropaleontologic
  • microphotographers
  • microphotographies
  • microradiographies
  • microreproductions
  • mineralocorticoids
  • misadministrations
  • misclassifications
  • misidentifications
  • misinterpretations
  • misrepresentations
  • monochromaticities
  • mucopolysaccharide
  • muddleheadednesses
  • multicellularities
  • multifariousnesses
  • myeloproliferative

  • neuroendocrinology
  • neuropharmacologic
  • neurophysiological
  • neurophysiologists
  • neuropsychiatrists
  • neuropsychological
  • neuropsychologists
  • neurotransmissions
  • nonanthropological
  • nonanthropologists
  • nonarbitrarinesses
  • noncommutativities
  • noncomparabilities
  • nonconfrontational
  • noncooperationists
  • nondeductibilities
  • nondestructiveness
  • nondiscriminations
  • nonfraternizations
  • noninterchangeable
  • noninterventionist
  • nonrepresentatives
  • nonrevolutionaries

  • obstreperousnesses
  • ophthalmologically
  • opinionativenesses
  • organophosphoruses
  • orthogonalizations
  • orthopsychiatrists
  • oscillographically
  • ostentatiousnesses
  • otherworldlinesses
  • overcapitalization
  • overcentralization
  • overclassification
  • overcommercialized
  • overcommercializes
  • overcommunications
  • overconcentrations
  • overembellishments
  • overextrapolations
  • overfertilizations
  • overgeneralization
  • overidentification
  • overindebtednesses
  • overindustrialized
  • overindustrializes
  • overinterpretation
  • overoptimistically
  • overprotectiveness
  • overrepresentation
  • oversimplification
  • overspecialization
  • ovolactovegetarian

  • paleoclimatologies
  • paleoclimatologist
  • particularizations
  • pathophysiological
  • pentachlorophenols
  • pentylenetetrazols
  • perchloroethylenes
  • perpendicularities
  • pertinaciousnesses
  • phenomenologically
  • pheochromocytomata
  • phonocardiographic
  • phosphodiesterases
  • phosphoglucomutase
  • photodecomposition
  • photodisintegrated
  • photodisintegrates
  • photodissociations
  • photolithographies
  • photolithographing
  • photomicrographies
  • photomorphogeneses
  • photomorphogenesis
  • photoreactivations
  • photoreproductions
  • photosensitivities
  • photosensitization
  • photosynthetically
  • physiopathological
  • phytohemagglutinin
  • piezoelectricities
  • polyacrylonitriles
  • polychromatophilia
  • polychromatophilic
  • polyesterification
  • polymorphonuclears
  • polyribonucleotide
  • postmillenarianism
  • postmillennialisms
  • postmillennialists
  • postpsychoanalytic
  • praiseworthinesses
  • predestinarianisms
  • premillenarianisms
  • preposterousnesses
  • presumptuousnesses
  • proletarianization
  • pronounceabilities
  • propagandistically
  • propertylessnesses
  • provincializations
  • pseudonymousnesses
  • pseudoparenchymata
  • pseudotuberculoses
  • pseudotuberculosis
  • psychoanalytically
  • psychobiographical
  • psychopathological
  • psychopathologists
  • psychopharmacology
  • psychophysiologies
  • psychophysiologist
  • puzzleheadednesses

  • quantificationally
  • quantitativenesses
  • quasiperiodicities
  • quattuordecillions
  • questionablenesses

  • radiochromatograms
  • radiosensitivities
  • rambunctiousnesses
  • rechromatographies
  • rechromatographing
  • reconstructionisms
  • reconstructionists
  • recrystallizations
  • redistributionists
  • rehospitalizations
  • reinstitutionalize
  • remunerativenesses
  • renationalizations
  • reprehensibilities
  • representationally
  • representativeness
  • representativities
  • revascularizations
  • rhabdomyosarcomata
  • ribonucleoproteins
  • roentgenologically

  • sacrilegiousnesses
  • satisfactorinesses
  • sedimentologically
  • semiconservatively
  • semidomestications
  • semipermeabilities
  • semiprofessionally
  • semiquantitatively
  • sentimentalization
  • shortsightednesses
  • simplemindednesses
  • simultaneousnesses
  • sociopsychological
  • somnambulistically
  • soporiferousnesses
  • spectrofluorimeter
  • spectrofluorometer
  • spectrofluorometry
  • spectrographically
  • spectroheliographs
  • spectroheliography
  • spectrohelioscopes
  • spectrophotometers
  • spectrophotometric
  • sphygmomanometries
  • stereophotographic
  • stereoregularities
  • stereospecifically
  • stoichiometrically
  • stoutheartednesses
  • structuralizations
  • subcategorizations
  • subclassifications
  • subconsciousnesses
  • submicroscopically
  • substitutabilities
  • superadministrator
  • superciliousnesses
  • supercivilizations
  • superconglomerates
  • superintellectuals
  • superintelligences
  • superminicomputers
  • supernaturalnesses
  • supersensitivities
  • supersophisticated
  • supranationalities

  • tachistoscopically
  • telecommunications
  • territorialization
  • theatricalizations
  • thermoluminescence
  • thermoplasticities
  • thrombophlebitides
  • transcendentalisms
  • transcendentalists
  • transformationally
  • transilluminations
  • transistorizations
  • transmissibilities
  • transmogrification
  • transportabilities
  • transubstantiating
  • transubstantiation
  • triboelectricities
  • triboluminescences
  • trichloroethylenes
  • triskaidekaphobias

  • ultracentrifugally
  • ultraconservatisms
  • ultraconservatives
  • ultramicroscopical
  • ultranationalistic
  • ultrarevolutionary
  • ultrasophisticated
  • unaccountabilities
  • unassailablenesses
  • unattractivenesses
  • unchangeablenesses
  • uncharitablenesses
  • uncompromisingness
  • unconscionableness
  • unconstitutionally
  • unconvincingnesses
  • unenthusiastically
  • ungrammaticalities
  • uniformitarianisms
  • unintelligibleness
  • unpredictabilities
  • unprinciplednesses
  • unprofitablenesses
  • unreasonablenesses
  • unresponsivenesses
  • unrestrainednesses
  • unsatisfactoriness
  • unscrupulousnesses
  • unseasonablenesses
  • unsubstantialities

  • vaingloriousnesses
  • valetudinarianisms
  • verisimilitudinous
  • videoconferencings

  • weatherproofnesses