- Agoraphobic
- Avoirdupois
- A bad pill to swallow
- A bed of roses
- A bird in hand is worth two in the bush
- A bit much
- A blood relative
- A cardinal error
- A dead duck
- A dead luck
- A dear john letter
- Abnormally
- Abode assylum
- Abolishment
- Abolitionism
- Abolitionist
- Abominable snowman
- Abomination
- Aboriginal
- Abreaction
- Abortive
- Abounding in waves
- About-face
- About-turn
- Above
- Above ones head
- Above ones reach
- Abstruse
- Absurbed notion
- Absurdist
- Abulia
- Abundance
- Abusing
- Abusive word
- Abusrdity
- Abut
- Abysm
- Academic
- Accede to
- Accomplice
- Accompliser
- Accomplishment
- Accordance
- Accordion
- Accost
- Acquainted jobs
- Acquatic
- Acquired immunodeficiency syndrome
- Acquirer
- Acquisition
- Acquittance roll
- Acrid taste
- Acridness
- Acrimony
- Acrobat
- Acronym
- Acrophobia
- Acrostic
- Acrylic
- Act
- Act a lie
- Act of god
- Acuity
- Acute
- Acute angle
- Acutely
- Ad hominem
- Ad rem
- Ada
- Adage
- Adam
- Adamant
- Adaptable
- Adapted
- Add
- Admit
- Admittance
- Admitting defeat
- Admonition
- Admonitory
- Adon
- Adonis
- Adopted son
- Adoptionism
- Advert
- Advisable
- Advise
- Advisedly
- Advisor
- Advocating anothers cause
- Adz
- Affecting horses
- Affective
- Afferent
- Affiance
- Affiliation
- Affinity
- Affirm
- Affirming
- Afflict