chew vs crunch

chew and crunch both are nouns.

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

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

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

chew (noun)	crunch (noun)
biting and grinding food in your mouth so it becomes soft enough to swallow	the act of crushing
a wad of something chewable as tobacco	the sound of something crunching
	a critical situation that arises because of a shortage (as a shortage of time or money or resources)

chew (verb)	crunch (verb)
chew (food); to bite and grind with the teeth	reduce to small pieces or particles by pounding or abrading
	make a crushing noise
	crush with the teeth, making a grinding sound
	press or grind with a crushing noise