chew vs chewing

chew and chewing both are nouns.

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

As nouns, chew and chewing are synonyms defined as:

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

Other synonyms of chew include manduction, mastication.

chew (noun)	chewing (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

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