upcountry vs interior

upcountry is not a noun while interior is a noun.

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

As adjectives, upcountry and interior are synonyms defined as:

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

Other synonyms of upcountry include midland.

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

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

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