chewing vs chew

chewing and chew both are nouns.

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

As nouns, chewing and chew are synonyms defined as:

chewing and chew: biting and grinding food in your mouth so it becomes soft enough to swallow

Other synonyms of chewing include manduction, mastication.

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

chewing (verb)	chew (verb)
	chew (food); to bite and grind with the teeth