Sunbelt vs geographical region

Sunbelt and geographical region both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sunbelt	Yes	No	No	No
geographical region	Yes	No	No	No

Sunbelt (noun)	geographical region (noun)
states in the south and southwest that have a warm climate and tend to be politically conservative	a demarcated area of the Earth