Tidewater region vs geographic area

Tidewater region and geographic area both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tidewater region	Yes	No	No	No
geographic area	Yes	No	No	No

Tidewater region (noun)	geographic area (noun)
the coastal plain of the South: eastern parts of Virginia and North Carolina and South Carolina and Georgia	a demarcated area of the Earth