- A thing or two
- A think tank
- A thorny question
- A tree which has shed its leaves
- A tune
- A type of plantain
- A water grass with umbrella-like foliage
- Aasvogel
- Abandon
- Abandonments
- Abash
- Abasing
- Abate
- Abattoir
- Abbey
- Abbot
- Abbreviated
- Abdomen
- Abdominal
- Abdominous
- Abductor
- Aberrational
- Abetment
- Abhorrence
- Abide
- Abide way
- Abiding
- Abigail
- Abjudication
- Abjure
- Ablative case
- Ablest
- Ablution
- Ablutophobia
- Abnegate
- Aboard
- Abode of ascetics
- Abodes
- Abolish
- Aboriginal hunters tribe
- Aborigine
- Abortion
- Abound in
- Abounds
- About
- Above par
- Above the weather
- Above-ground
- Aboveboard
- Abrasion
- Abridge
- Abridgment
- Abrigement
- Abrus
- Abscond with
- Absent-minded
- Absentation from mention
- Absolute majority
- Absolute ruler
- Absolution
- Absolve
- Absorber
- Abstain
- Abstention
- Abstract
- Accentuate
- Accessed
- Accidental
- Accidentality
- Acclamatory shouting
- Acclimatization
- Accommodation
- Accrete
- Accrued expenses
- Accusatory
- Accuser
- Accusing
- Accusingly
- Ace player
- Acerbic
- Acquisitiveness
- Acquit
- Acrid
- Acridity
- Acrobatic feat
- Actually
- Acumen
- Acute pain
- Ad-lib
- Adagio
- Adams apple
- Adapt to
- Adaptableness
- Adaptation
- Adc
- Add on
- Add up
- Addicted
- Addictive
- Adding