meaningful vs substantive

meaningful is not a noun while substantive is a noun.

Word	Noun	Adjective	Verb	Adverb
meaningful	No	Yes	No	No
substantive	Yes	Yes	No	No

meaningful (noun)	substantive (noun)
	any word or group of words functioning as a noun

meaningful (adjective)	substantive (adjective)
having a meaning or purpose	defining rights and duties as opposed to giving the rules by which rights and duties are established
	of or relating to the real nature or essential elements of something
	being on topic and prompting thought