caustic vs destructive

caustic is a noun but destructive is not a noun.

Word	Noun	Adjective	Verb	Adverb
caustic	Yes	Yes	No	No
destructive	No	Yes	No	No

caustic (noun)	destructive (noun)
the envelope of light rays reflected or refracted by a curved surface or object
any chemical substance that burns or destroys living tissue

caustic (adjective)	destructive (adjective)
of a substance, especially a strong acid; capable of destroying or eating away by chemical action	causing destruction or much damage
harsh or corrosive in tone