adulterating vs adulterant

adulterating is not a noun while adulterant is a noun.

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

As adjectives, adulterating and adulterant are synonyms defined as:

adulterating and adulterant: making impure or corrupt by adding extraneous materials

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

adulterating (adjective)	adulterant (adjective)
making impure or corrupt by adding extraneous materials	making impure or corrupt by adding extraneous materials