shallow vs modify

shallow is a noun but modify is not a noun.

Word	Noun	Adjective	Verb	Adverb
shallow	Yes	Yes	Yes	No
modify	No	No	Yes	No

As verbs, modify is a hypernym of shallow; that is, modify is a word with a broader meaning than shallow:

Other hypernyms of shallow include alter, change.

shallow (noun)	modify (noun)
a stretch of shallow water

shallow (adjective)	modify (adjective)
lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center
not deep or strong; not affecting one deeply
lacking depth of intellect or knowledge; concerned only with what is obvious

shallow (verb)	modify (verb)
become shallow	make less severe or harsh or extreme
make shallow	add a modifier to a constituent
	cause to change; make different; cause a transformation