substantiate vs substantiative

substantiate is not an adjective while substantiative is an adjective.

Word	Noun	Adjective	Verb	Adverb
substantiate	No	No	Yes	No
substantiative	No	Yes	No	No

substantiate (adjective)	substantiative (adjective)
	serving to support or corroborate

substantiate (verb)	substantiative (verb)
solidify, firm, or strengthen
establish or strengthen as with new evidence or facts
make real or concrete; give reality or substance to
represent in bodily form