mordant vs sarcastic

mordant is a noun but sarcastic is not a noun.

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

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

mordant (adjective)	sarcastic (adjective)
of a substance, especially a strong acid; capable of destroying or eating away by chemical action	expressing or expressive of ridicule that wounds
harshly ironic or sinister