wield vs ply

wield is not a noun while ply is a noun.

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

As verbs, ply is a hyponym of wield; that is, ply is a word with a more specific, narrower meaning than wield:

Other hyponyms of wield include pump, sweep, swing, swing out.

wield (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

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