- atomizer
- Apostle
- agraphia
- arbitrament
- appellate court
- asteroid
- assonance
- ataxy
- appropriator
- apogee
- aeronautical engineering
- assiduously
- air attack
- ameba
- annunciator
- austral
- augmentative
- aural
- according
- articular
- ambergris
- arrack
- assam
- agreeably
- asunder
- appeasable
- Addressograph
- addressing machine
- agony column
- air sac
- arabian peninsula
- arabic language
- adulterant
- amputator
- artfulness
- at length
- acre
- associative
- agnation
- aesthetics
- accrediting
- ambient
- anterior naris
- amanuensis
- arete
- agamic
- adverse witness
- amoeba
- asymmetric
- affinal