ability, capability
proficiency, efficiency
abnormal, irregular
abruptly, suddenly
absolutely, completely
absurd, ridiculous
abundant, abounding
accelerate, expedite
accept, admit
access, approach
accommodation residence
accomplish, succeed
accordingly, consequently
accumulate, collect
accurate, precise
accuse, blame
achieve, succeed
acknowledge, accept
acquire, attain
activate, stimulate
active, energetic, dynamic
adapt adjust
add, increase. supplement
addict, drunkard
adolescent, youngster
adult, grown-up
advantage, benefit
advise, suggest, recommend
affair, business
affection, fondness
affluent, prosperous
aggravate, exasperate