South Ossetian Republic vs Republic of South Ossetia

South Ossetian Republic and Republic of South Ossetia both are nouns.

Word	Noun	Adjective	Verb	Adverb
South Ossetian Republic	Yes	No	No	No
Republic of South Ossetia	Yes	No	No	No

As nouns, South Ossetian Republic and Republic of South Ossetia are synonyms defined as:

South Ossetian Republic and Republic of South Ossetia: disputed state in the South Caucasus

Other synonyms of South Ossetian Republic include South Ossetia.

South Ossetian Republic (noun)	Republic of South Ossetia (noun)
disputed state in the South Caucasus	disputed state in the South Caucasus