frizzy vs nappy

frizzy is not a noun while nappy is a noun.

Word	Noun	Adjective	Verb	Adverb
frizzy	No	Yes	No	No
nappy	Yes	Yes	No	No

As adjectives, frizzy and nappy are synonyms defined as:

Other synonyms of frizzy include crisp, frizzly, kinky.

frizzy (noun)	nappy (noun)
	garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement

frizzy (adjective)	nappy (adjective)
(of hair) in small tight curls	(of hair) in small tight curls