spurious vs counterfeit

spurious is not a noun while counterfeit is a noun.

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

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

spurious (adjective)	counterfeit (adjective)
false or fake; not what it appears to be	not genuine; imitating something superior
plausible but false
born out of wedlock
ostensibly valid, but not actually valid

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