- apostacy
- accordance
- amusement park
- agony aunt
- apparatus
- activism
- apparition
- appeal
- all night
- accordingly
- anchovy
- appearance
- appendage
- alameda
- acquirer
- add lustre to
- amaranthus
- apple of one's eye
- appleton layer
- amen
- applicator
- action plan
- applique
- age limit
- abyssal
- a game of cards
- appointed
- appointment
- aqua
- appraisal
- appreciation
- all-pervading
- ampere
- apprehensible
- appress
- active and passive voices
- approachable
- adjectivally
- altair
- approval
- acrophobia
- abraham
- adrenalin
- appulse
- apt
- a cross-breed of male horse and female deer
- aqua regia
- aqua-lung
- aquaculture
- all star
- aquaphobia
- aquarist
- aquarius
- anatomist
- arabian
- arabian jasmine
- a good or great many
- a bitter pill to swallow
- arbitrary
- arbitrate
- arbitration
- arc
- arcanum
- amphipod
- arch-enemy
- archaism
- arched
- aladdin
- an ornament
- a bed of nails
- archon
- arctic
- air-sea rescue
- ardent desire
- area
- american politics
- ad hominem
- a grain of paddy
- abusive words
- arena
- a feather in one's cap
- alright
- alchemist
- aright
- alliteration
- aristocratic
- aero logy
- air rifle
- armoured
- abettor
- armaments
- armature
- armband
- armchair
- armory
- acerbic
- armoured soldiers
- armourer
- armoury
- arms