interior vs upcountry

interior is a noun but upcountry is not a noun.

Word	Noun	Adjective	Verb	Adverb
interior	Yes	Yes	No	No
upcountry	No	Yes	No	Yes

As adjectives, interior and upcountry are synonyms defined as:

interior and upcountry: of or coming from the middle of a region or country

Other synonyms of interior include midland.

interior (noun)	upcountry (noun)
the inner or enclosed surface of something
the region that is inside of something

interior (adjective)	upcountry (adjective)
situated within or suitable for inside a building	of or coming from the middle of a region or country
inside the country
of or coming from the middle of a region or country
inside and toward a center
located inward

interior (adverb)	upcountry (adverb)
	to or in the interior of a country or region