plural form vs states' rights

plural form and states' rights both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural form	Yes	No	No	No
states' rights	Yes	No	No	No

plural form (noun)	states' rights (noun)
the form of a word that is used to denote more than one	the rights conceded to the states by the United States constitution
	a doctrine that federal powers should be curtailed and returned to the individual states