Republic of Belarus vs Belarus

Republic of Belarus and Belarus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Belarus	Yes	No	No	No
Belarus	Yes	No	No	No

As nouns, Republic of Belarus and Belarus are synonyms defined as:

Republic of Belarus and Belarus: a landlocked republic in eastern Europe; formerly a European soviet

Other synonyms of Republic of Belarus include Belorussia, Byelarus, Byelorussia, White Russia.

Republic of Belarus (noun)	Belarus (noun)
a landlocked republic in eastern Europe; formerly a European soviet	a landlocked republic in eastern Europe; formerly a European soviet