Tidewater region vs geographical area

Tidewater region and geographical area both are nouns.

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

Tidewater region (noun)	geographical 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