North Korea vs DPRK

North Korea and DPRK both are nouns.

Word	Noun	Adjective	Verb	Adverb
North Korea	Yes	No	No	No
DPRK	Yes	No	No	No

As nouns, North Korea and DPRK are synonyms defined as:

North Korea and DPRK: a communist country in the northern half of the Korean Peninsula; established in 1948

Other synonyms of North Korea include D.P.R.K., Democratic People's Republic of Korea.

North Korea (noun)	DPRK (noun)
a communist country in the northern half of the Korean Peninsula; established in 1948	a communist country in the northern half of the Korean Peninsula; established in 1948