territory vs Northern Mariana Islands

territory and Northern Mariana Islands both are nouns.

Word	Noun	Adjective	Verb	Adverb
territory	Yes	No	No	No
Northern Mariana Islands	Yes	No	No	No

territory (noun)	Northern Mariana Islands (noun)
an area of knowledge or interest	a self-governing territory comprising all of the Mariana Islands except Guam
a region marked off for administrative or other purposes
the geographical area under the jurisdiction of a sovereign state