geographical region vs Hijaz

geographical region and Hijaz both are nouns.

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

geographical region (noun)	Hijaz (noun)
a demarcated area of the Earth	a coastal region of the western Arabian Peninsula bordering on the Red Sea; includes both Mecca and Medina; formerly an independent kingdom until it united with Nejd to form the Kingdom of Saudi Arabia