Iberia vs geographic region

Iberia and geographic region both are nouns.

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

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