- A good while
- A hand-blow
- A hard nut to crack
- A heavy heart
- A hell on earth
- A helping hand
- A hill tribe
- A hit below the belt
- A homely game
- A jain priest
- A lamb to the slaughter
- A lame duck
- A level
- A little
- Admin
- Aberrational
- Abetment
- Abhorrence
- Abide
- Abide way
- Abiding
- Abigail
- Abjudication
- Abjure
- Ablative case
- Ablest
- Ablution
- Ablutophobia
- Abnegate
- Above the weather
- Above-ground
- Aboveboard
- Abrasion
- Abridge
- Abridgment
- Abrigement
- Abrus
- Abscond with
- Absent-minded
- Abstraction
- Absurd drama
- Abusive words
- abuzz
- Acacia
- Academician
- Academics
- Accompaniments
- Accomplish
- Accomplished
- Accomplishment quotient
- Accordant
- Accorded
- Accordingly
- Accountrements
- Accounts payable
- Accounts receivable
- Accoustics
- Acetic acid
- Ache
- Acid lemon
- Acidophilus
- Acidulous
- Acknowledge
- Acknowledged
- Acm
- Acne
- Acorn
- Acoustic
- Act of peace
- Action meter
- Action-packed
- Activate
- Active server pages
- Active service
- Active voice
- Actively
- Activeness
- Activewear
- Actress
- Actual
- Actualise
- Actually
- Acumen
- Acute pain
- Ad-lib
- Adagio
- Adams apple
- Adapt to
- Adaptableness
- Adaptation
- Adc
- Adhere
- Adhering
- Adjacent
- Adjoin
- Adjudge
- Adjudication
- Adjudicator
- Adjunct
- Adman