abash
to embarrass
abate
to subside, to reduce
abdicate
to step down from power
aberration
a deviation from the norm (starts with ab)
abhor
to detest
abject
hopeless, extremely sad and servile (starts with a)
abnegate
to renounce
abortive
unsuccessful
abridge
to shorten (starts with a)
absolute
total
absolve
to free from blame or sin, to remove responsibility