gumming vs chew

gumming and chew both are nouns.

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

As nouns, chew is a hypernym of gumming; that is, chew is a word with a broader meaning than gumming:

gumming: ineffectual chewing (as if without teeth)
chew: biting and grinding food in your mouth so it becomes soft enough to swallow

Other hypernyms of gumming include chewing, manduction, mastication.

gumming (noun)	chew (noun)
ineffectual chewing (as if without teeth)	biting and grinding food in your mouth so it becomes soft enough to swallow
	a wad of something chewable as tobacco

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