United Mexican States vs Sierra Madre Oriental

United Mexican States and Sierra Madre Oriental both are nouns.

Word	Noun	Adjective	Verb	Adverb
United Mexican States	Yes	No	No	No
Sierra Madre Oriental	Yes	No	No	No

United Mexican States (noun)	Sierra Madre Oriental (noun)
a republic in southern North America; became independent from Spain in 1810	a mountain range in northeastern Mexico the runs parallel to the coastline of the Gulf of Mexico