combining form vs ply

combining form and ply both are nouns.

Word	Noun	Adjective	Verb	Adverb
combining form	Yes	No	No	No
ply	Yes	No	Yes	No

combining form (noun)	ply (noun)
a bound form used only in compounds	(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

combining form (verb)	ply (verb)
	give what is desired or needed, especially support, food or sustenance
	use diligently
	wield vigorously
	join together as by twisting, weaving, or molding
	travel a route regularly
	apply oneself diligently