- assist
- assiduous
- asshole
- assertive
- assent
- assault
- assailant
- assess
- awe-inspiring
- a king's ransom
- ass
- aspirin
- aspersions
- asperity
- awe
- asparagus
- asoka forest
- asleep
- askew
- askant
- aside from
- aside
- asexuality
- ascorbic acid
- ascertain
- ascariasis
- asap
- as you sow so you reap
- as the case may be
- as safe as houses
- as it were
- as gay as a lark
- as free as air
- arum
- artistic
- artisan
- artillary
- artificialness
- artificial
- alkali
- awakening
- articles of association
- art of war
- avowed
- arsenic
- abulia
- arsenal
- arrowhead
- arrow-tip
- arrow-root-flour
- arrow-root flower
- arrow point
- arrogance
- avoid
- arrival
- array
- arras
- arrant
- airpower
- arraign
- arrack
- arpanet
- avocado
- aircraft carrier
- aroma
- army
- ahead of one's time, ahead of its time
- arms
- armoury
- armourer
- armoured soldiers
- armory
- armchair
- armband
- armature
- armaments
- aha
- adulteress
- ambient
- anacardium occidentale
- a dirty trick
- allegro
- analyze
- admire for
- air-cooled
- a signal achievement
- above par
- address book
- abstention from condemning
- adaptableness
- according to schedule
- amranthus polystachys
- a good many
- a dream come true
- a lack-all
- anaesthesiologist
- a bird in hand is worth two in the bush
- abrus precatorius
- accumbent
- a fractuary