Greater Maghreb vs geographical region

Greater Maghreb and geographical region both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greater Maghreb	Yes	No	No	No
geographical region	Yes	No	No	No

Greater Maghreb (noun)	geographical region (noun)
the region of northwest Africa comprising the Atlas Mountains and the coastlands of Morocco and Algeria and Tunisia	a demarcated area of the Earth