chew vs chaw

chew and chaw both are nouns.

Word	Noun	Adjective	Verb	Adverb
chew	Yes	No	Yes	No
chaw	Yes	No	Yes	No

As nouns, chew and chaw are synonyms defined as:

Other synonyms of chew include cud, plug, quid, wad.

As verbs, chaw is a hyponym of chew; that is, chaw is a word with a more specific, narrower meaning than chew:

Other hyponyms of chew include champ, chomp, champ, gum, mumble, crunch, munch, gnaw.

chew (noun)	chaw (noun)
biting and grinding food in your mouth so it becomes soft enough to swallow	a wad of something chewable as tobacco
a wad of something chewable as tobacco

chew (verb)	chaw (verb)
chew (food); to bite and grind with the teeth	chew without swallowing