Northern Mariana Islands vs territorial dominion

Northern Mariana Islands and territorial dominion both are nouns.

Word	Noun	Adjective	Verb	Adverb
Northern Mariana Islands	Yes	No	No	No
territorial dominion	Yes	No	No	No

Northern Mariana Islands (noun)	territorial dominion (noun)
a self-governing territory comprising all of the Mariana Islands except Guam	a region marked off for administrative or other purposes