- abandon13
- abbreviation23
- abdication18
- abdomen15
- abduction18
- abecedarian19
- abelian12
- aberration14
- abjection25
- abjuration24
- ablation13
- ablution14
- abnegation17
- abolition14
- abomination19
- aboon9
- abortion12
- abrasion12
- abreaction17
- abrogation16
- abruption17
- abscisin15
- abscission17
- absolution16
- absorption17
- abstain11
- abstention15
- abstraction18
- abutilon14
- academician22
- acanthocephalan31
- acaridan13
- acceleration20
- accentuation21
- acceptation21
- accession16
- acclamation22
- acclimation22
- acclimatization35
- accommodation27
- accordion17
- accreditation21
- accretion16
- acculturation23
- accumulation25
- accusation18
- accustomation24
- acetaminophen26
- acetification23
- acetin10
- acetophenetidin26
- acetylation18
- acidification24
- acidulation18
- acorn9
- acoustician19
- acquisition25
- acrasin11
- acrogen13
- acrolein13
- acromion15
- actin9
- actinian13
- actinomycin24
- actinon12
- action10
- activation18
- actomyosin19
- actualization28
- actuation14
- acumen14
- acylation16
- acyloin14
- adaptation15
- adaption13
- addiction15
- addition11
- adduction16
- adhesion12
- adjoin17
- adjourn19
- adjudication28
- adjunction26
- adjuration22
- adman10
- admen10
- administration20
- admiration15
- admission14
- admonition16
- adnation11
- adnoun10
- adoption13
- adoration11
- adorn7
- adown10
- adrenocorticotrophin34
- adrenocorticotropin31
- adsorption15
- adulation13