extraneous vs adulterant

extraneous is not a noun while adulterant is a noun.

Word	Noun	Adjective	Verb	Adverb
extraneous	No	Yes	No	No
adulterant	Yes	Yes	No	No

extraneous (noun)	adulterant (noun)
	any substance that lessens the purity or effectiveness of a substance

extraneous (adjective)	adulterant (adjective)
not belonging to that in which it is contained; introduced from an outside source	making impure or corrupt by adding extraneous materials
not pertinent to the matter under consideration
coming from the outside
not essential