counterfeit vs fictive

counterfeit is a noun but fictive is not a noun.

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

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

counterfeit (adjective)	fictive (adjective)
not genuine; imitating something superior	adopted in order to deceive
	capable of imaginative creation

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