meaty vs substantive

meaty is not a noun while substantive is a noun.

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

As adjectives, meaty and substantive are synonyms defined as:

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

meaty (adjective)	substantive (adjective)
like or containing meat	defining rights and duties as opposed to giving the rules by which rights and duties are established
being on topic and prompting thought	of or relating to the real nature or essential elements of something
	being on topic and prompting thought