Mongolian People's Republic vs Mongolia

Mongolian People's Republic and Mongolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mongolian People's Republic	Yes	No	No	No
Mongolia	Yes	No	No	No

As nouns, Mongolian People's Republic and Mongolia are synonyms defined as:

Mongolian People's Republic and Mongolia: a landlocked socialist republic in central Asia

Other synonyms of Mongolian People's Republic include Outer Mongolia.

Mongolian People's Republic (noun)	Mongolia (noun)
a landlocked socialist republic in central Asia	a landlocked socialist republic in central Asia
	a vast region in Asia including the Mongolian People's Republic and China's Inner Mongolia