mordant vs vitriolic

mordant is a noun but vitriolic is not a noun.

Word	Noun	Adjective	Verb	Adverb
mordant	Yes	Yes	No	No
vitriolic	No	Yes	No	No

As adjectives, mordant and vitriolic are synonyms defined as:

mordant and vitriolic: of a substance, especially a strong acid; capable of destroying or eating away by chemical action

Other synonyms of mordant include caustic, corrosive, erosive.

mordant (noun)	vitriolic (noun)
a substance used to treat leather or other materials before dyeing; aids in dyeing process

mordant (adjective)	vitriolic (adjective)
of a substance, especially a strong acid; capable of destroying or eating away by chemical action	of a substance, especially a strong acid; capable of destroying or eating away by chemical action
harshly ironic or sinister	harsh or corrosive in tone