- Antifreeze
- Antigen
- Antiperspirant
- Antiphon
- Antiseptic
- Antisocial
- Ants
- Ants in ones pants
- Antsy
- Aphid
- Aphrodisiac
- Apiology
- Apnoea
- Apocryphal
- Apodyopsis
- Apogee
- Apology
- Apophenia
- Apophysis
- Apoptosis
- Aporia
- Apostasy
- Apostate
- Applicability
- Application form
- Applies
- Applying
- Appointee
- Apportion
- Appraise
- Appraisement
- Appreciable
- Appreciated
- Aptitude test
- Aqua-lung
- Aquaponics
- Aquaris
- Aquarist
- Aquarium
- Aqueduct
- Aquiline
- Arab colonist
- Arabian
- Arabian sea
- Arable
- Arbitrate
- Arbitration
- Arbitrator
- Arbitrators
- Archway
- Arctic
- Arctic pole
- Ardent desire
- Ardent spirits
- Ardently
- Area
- Areca
- Areca leaves
- Areca palm
- Arecanut palm
- Arete
- Argot
- Argument
- Argumentative
- Argy-bargy
- Arrows
- Arse over tit
- Arsenic
- Arsis
- Arson
- Art
- Art of creating new meaning by deleting one word
- Art work
- Artesian well
- Articles
- Articulate
- Artificer
- Artificial insemination
- Artificiality
- Artistically
- Artistry
- Arts and crafts
- As
- As a first step
- As a man
- As proud as a peacock
- As regards
- As right as rain
- As safe as houses
- As soon as
- As soon as possible
- As the case may be
- As the crow flies
- As thin as a lath
- As usual
- Asafetida
- Asap
- Ascendancy
- Assemble
- Assent