- Anhydride
- Anima
- Animadvert
- Animal
- Animalcule
- Animals
- Animated
- Animator
- Animosity
- Aniseed
- Ankle
- Anklet with bells
- Annals
- Anonymous letter
- Anorexic
- Another key
- Answer back to
- Answer for
- Antechamber
- Antennae
- Antepenultimate
- Anticipation
- Anticipative
- Antihelmintic
- Antihistamines
- Antilog
- Antilogarithm
- Antimacassar
- Antinomy
- Antiquity
- Antithesis
- Antithetical
- Antitype
- Antral gastritis
- Aphorism
- Apiculture
- Aplomb
- Apocalypse
- Apollo
- Apologetic
- Apologia
- Apologise
- Apologist
- Apophatic
- Apostacy
- Apostle
- Apothegm
- Appliance
- Application
- Applied mathematics
- Applied science
- Appositely
- Appositeness
- Apprehend
- Apprehension
- Apprehensively
- Apprise
- Apprize
- Approachable
- Approbate
- Approbatory
- Approve
- Approving
- April
- Apriori
- Apriorism
- Apropos
- Apse
- Arboured
- Arcanum
- Arch
- Arch-work
- Archaeological
- Archaeology
- Archaic
- Archaism
- Archbishopric
- Archeology
- Archipelago
- Architecter
- Architecture
- Aright
- Aril
- Arithmetically
- Arithmetician
- Arjuna
- Armband
- Armlet
- Armoured
- As and when
- Arrogant
- Arrogate
- Arrow
- Arrow and bow
- Arrow point
- Arrow-root flower
- Arrow-root powder
- Arrow-root-flour
- Art director
- Arthropod