gratify vs ply

gratify is not a noun while ply is a noun.

Word	Noun	Adjective	Verb	Adverb
gratify	No	No	Yes	No
ply	Yes	No	Yes	No

As verbs, ply is a hypernym of gratify; that is, ply is a word with a broader meaning than gratify:

Other hypernyms of gratify include cater, provide, supply.

gratify (noun)	ply (noun)
	(usually in combinations) one of several layers of cloth or paper or wood as in plywood
	one of the strands twisted together to make yarn or rope or thread; often used in combination

gratify (verb)	ply (verb)
yield (to); give satisfaction to	give what is desired or needed, especially support, food or sustenance
make happy or satisfied	use diligently
	wield vigorously
	join together as by twisting, weaving, or molding
	travel a route regularly
	apply oneself diligently