geographical region vs Pontus

geographical region and Pontus both are nouns.

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

geographical region (noun)	Pontus (noun)
a demarcated area of the Earth	an ancient region of northern Asia Minor on the Black Sea; it reached its height under Mithridates VI but was later incorporated into the Roman Empire
	(Greek mythology) ancient personification of the sea; father of Nereus