adulterant vs adulterating

adulterant is a noun but adulterating is not a noun.

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

As adjectives, adulterant and adulterating are synonyms defined as:

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

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

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