Artist, artificer, artisan, mechanic, operative, workman.
Artless, boorish, clownish, hoidenish, rude, uncouth, unsophisticated.
Assent, agree, comply.
Assurance, effrontery, hardihood, impertinence, impudence, incivility, insolence, officiousness, rudeness.
Atom, grain, scrap, particle, shred, whit.
Atrociousness, barbaric, barbarous, brutal, merciless.
Attack, assault, infringement, intrusion, onslaught.
Attain, accomplish, achieve, arrive at, compass, reach, secure.
Attempt, endeavor, essay, strive, try, undertake.
Attitude, pose, position, posture.