Appreciable vs. Appreciative
Ark vs. Arc
Are vs. Our
Rise vs. Arise
Round vs. Around
Arouse vs. Rouse
Artist vs. Artiste
Arty vs. Artful
Assistants vs. Assistance
Astrology vs. Astronomy
Atheist vs. Agnostic
Attenuate vs. Extenuate
Auger vs. Augur
Aural vs. Oral
Avenge vs. Revenge
Avocation vs. Vocation
Await vs. Wait
Axiom vs. Maxim
Backward vs. Backwards
Baited vs. Bated