mordant vs erosive

mordant is a noun but erosive is not a noun.

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

As adjectives, mordant and erosive are synonyms defined as:

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

Other synonyms of mordant include caustic, corrosive, vitriolic.

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

mordant (adjective)	erosive (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	wearing away by friction