law vs substantive

law and substantive both are nouns.

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

law (noun)	substantive (noun)
the learned profession that is mastered by graduate study in a law school and that is responsible for the judicial system	any word or group of words functioning as a noun
a rule or body of rules of conduct inherent in human nature and essential to or binding upon human society
a generalization that describes recurring facts or events in nature
the branch of philosophy concerned with the law and the principles that lead courts to make the decisions they do
legal document setting forth rules governing a particular kind of activity
the collection of rules imposed by authority
the force of policemen and officers

law (adjective)	substantive (adjective)
	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