counterfeit vs genuine

counterfeit is a noun but genuine is not a noun.

Word	Noun	Adjective	Verb	Adverb
counterfeit	Yes	Yes	Yes	No
genuine	No	Yes	No	No

counterfeit (noun)	genuine (noun)
a copy that is represented as the original

counterfeit (adjective)	genuine (adjective)
not genuine; imitating something superior	not fake or counterfeit
	not pretended; sincerely felt or expressed
	being or reflecting the essential or genuine character of something

counterfeit (verb)	genuine (verb)
make a copy of with the intent to deceive