Republic of Belarus vs Byelarus

Republic of Belarus and Byelarus both are nouns.

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

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

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

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

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