geographic region vs Iberia

geographic region and Iberia both are nouns.

Word	Noun	Adjective	Verb	Adverb
geographic region	Yes	No	No	No
Iberia	Yes	No	No	No

geographic region (noun)	Iberia (noun)
a demarcated area of the Earth	a peninsula in southwestern Europe
	an ancient geographical region to the south of the Caucasus Mountains that corresponded approximately to the present-day Georgia