adulterant vs extraneous

adulterant is a noun but extraneous is not a noun.

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

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

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