20 letter words, grouped by first letter

  • acetylcholinesterase
  • adrenocorticosteroid
  • adrenocorticotrophic
  • adrenocorticotrophin
  • adrenocorticotropins
  • anthropocentricities
  • anthropomorphization
  • antiauthoritarianism
  • anticonservationists
  • antifluoridationists

  • bacteriochlorophylls
  • buckminsterfullerene

  • chemotherapeutically
  • chlorofluoromethanes
  • compartmentalization
  • comprehensiblenesses
  • contradistinguishing
  • conventionalizations
  • counterconditionings
  • counterdemonstrating
  • counterdemonstration
  • counterdemonstrators
  • counterintelligences
  • countermobilizations
  • counterrevolutionary
  • countersurveillances
  • countertransferences
  • crystallographically
  • cytodifferentiations

  • dehydrochlorinations
  • deindustrializations
  • deinstitutionalizing
  • deoxyribonucleotides
  • departmentalizations
  • dimethylnitrosamines
  • distinguishabilities

  • electrocardiographic
  • electroencephalogram
  • electroluminescences
  • electrooculographies
  • electrophotographies
  • electrophysiological
  • electrophysiologists
  • electroretinographic
  • encephalomyocarditis
  • existentialistically
  • expressionlessnesses
  • extemporaneousnesses

  • forethoughtfulnesses

  • glomerulonephritides

  • histocompatibilities
  • homotransplantations
  • hydrochlorothiazides
  • hypercholesterolemia
  • hypercholesterolemic
  • hypercoagulabilities
  • hyperconsciousnesses
  • hyperparathyroidisms
  • hypersensitivenesses

  • immunocytochemically
  • immunohistochemistry
  • immunoprecipitations
  • inappreciativenesses
  • incommensurabilities
  • incomprehensibleness
  • inconsequentialities
  • inconsiderablenesses
  • indestructiblenesses
  • indiscriminatenesses
  • indistinguishability
  • institutionalization
  • intellectualizations
  • interchangeabilities
  • interconnectednesses
  • internationalization
  • interstratifications
  • irreconcilablenesses
  • irreproachablenesses

  • keratoconjunctivites
  • keratoconjunctivitis

  • lymphogranulomatoses
  • lymphogranulomatosis

  • magnetofluiddynamics
  • magnetohydrodynamics
  • microcrystallinities
  • microelectrophoreses
  • microelectrophoresis
  • microelectrophoretic
  • microminiaturization
  • micropaleontological
  • micropaleontologists
  • microphotometrically
  • mischaracterizations

  • neuroendocrinologies
  • neuroendocrinologist
  • neuropharmacological
  • neuropharmacologists
  • neurophysiologically
  • neuropsychiatrically
  • nondenominationalism
  • nondestructivenesses
  • noninstitutionalized

  • overdifferentiations
  • overenthusiastically
  • overintellectualized
  • overintellectualizes
  • overprotectivenesses

  • paleoanthropological
  • paleoanthropologists
  • paradichlorobenzenes
  • parathyroidectomized
  • phenylpropanolamines
  • phenylthiocarbamides
  • philoprogenitiveness
  • phosphatidylcholines
  • phosphoenolpyruvates
  • phosphofructokinases
  • phosphomonoesterases
  • photoautotrophically
  • photodisintegrations
  • photointerpretations
  • photophosphorylation
  • photoreconnaissances
  • plethysmographically
  • polyphiloprogenitive
  • professionalizations
  • pseudocholinesterase
  • pseudoparenchymatous
  • pseudosophistication
  • psychopathologically
  • psychopharmacologies
  • psychopharmacologist

  • radioimmunoassayable
  • radiopharmaceuticals
  • reconceptualizations
  • reindustrializations
  • reinstitutionalizing
  • representationalisms
  • representationalists
  • representativenesses
  • roentgenographically

  • semiautobiographical
  • spectrofluorometries
  • spectroheliographies
  • spectrophotometrical
  • superspecializations
  • syncategorematically

  • tetrahydrocannabinol
  • transformationalists

  • ultracentrifugations
  • ultramicroscopically
  • ultrarevolutionaries
  • ultrasegregationists
  • uncharacteristically
  • uncompromisingnesses
  • unconscionablenesses
  • underrepresentations
  • unintelligiblenesses
  • unrepresentativeness
  • unsatisfactorinesses