- air-sea rescue
- a bed of nails
- an ornament
- aladdin
- amphipod
- a bitter pill to swallow
- a good or great many
- anatomist
- all star
- a cross-breed of male horse and female deer
- adrenalin
- abraham
- acrophobia
- adjectivally
- ampere
- all-pervading
- abyssal
- age limit
- action plan
- amen
- amaranthus
- add lustre to
- alameda
- all night
- agony aunt
- amusement park
- a little only
- all sorts
- and a half
- afford to
- amazon
- afganisthan
- aeriform
- allerliefste
- abnegation
- abound
- about
- accept
- absentee
- abstain
- absolve
- abstinence
- academic
- academy
- acclaimed
- acclamation
- acclimatization
- accompaniment
- accredited
- acid
- accurate
- achilles' heel
- acknowledge
- acquainted
- acquit
- addiction
- action
- acumen
- acute
- adaptation
- add up
- addendum
- addled
- address
- adherent
- adjoin
- adjoining
- adjudication
- adjustment
- admirable
- adolescent
- adorn
- adornment
- advisory
- affecting
- affirmative
- afflict
- afloat
- afoot
- afraid
- after-effect
- aged
- agony
- agitate
- agreeable
- air
- airy-fairy
- aisle
- abrogation
- abate
- abattoir
- anthocyanins
- anthropic
- anthropogenic
- anthropologist
- anthropology
- anti-grammatical
- antidote
- antifoundationalism
- antigen