- Affirmed
- Affixing signature
- Affixture
- Afflatus
- Afflict with
- Affluence
- Afford
- Afforestation
- Aggressiveness
- Agitated
- Agitated person
- Agitation
- Agnomen
- Agnostic
- Agnosticism
- Agonize
- Agony
- Agoraphobia
- Agree on
- Agreeable
- Agricultural
- Agriculturalist
- Agroecosystem
- Agrology
- Aha
- Ahtma and anathma
- Aim
- Aiming
- Aims
- Airless
- Airlift
- Airpower
- Airs
- Airtime
- Airworthy
- Alacarte
- Alack
- Alameda
- Alarming
- Alimentary
- Alive
- Alkaline
- All
- All dressed up with nowhere to go
- All fools day
- All found
- All hail
- All in all
- All is well
- Alms
- Aloft
- Alogical
- Along shore
- Alp
- Alphabet
- Alphabetical order
- Alphabets
- Already
- Altar piece
- Amaze
- Amazed
- Ambidexterity
- Ambidextor
- Ambiguousness
- Ambit
- Amble
- Ambrosial
- Ambuscade
- Ambush
- Amende honorable
- Amends
- Amenities
- Amount
- Amounting
- Ampalappuzha
- Amphipod
- Amphitheater
- Amphitheatre
- Amplitude
- Amputation
- Amranthus polystachys
- Amulet
- Amused
- Amusement arcade
- Anabolic steroid
- Anachronistic
- Anaemic
- Anagram
- Anal
- Analectic
- Analgesic
- Analogue
- Analyse
- Anandrous
- Anaphase
- Anecdotal
- Anemic
- Anemone
- Anesthetize
- Anew