upcountry vs up-country

upcountry is an adjective but up-country is not an adjective.

Word	Noun	Adjective	Verb	Adverb
upcountry	No	Yes	No	Yes
up-country	No	No	No	Yes

As adverbs, upcountry and up-country are synonyms defined as:

upcountry (adjective)	up-country (adjective)
of or coming from the middle of a region or country

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