Sunbelt vs geographic area

Sunbelt and geographic area both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sunbelt	Yes	No	No	No
geographic area	Yes	No	No	No

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