White Russia vs Byelarus

White Russia and Byelarus both are nouns.

Word	Noun	Adjective	Verb	Adverb
White Russia	Yes	No	No	No
Byelarus	Yes	No	No	No

As nouns, White Russia and Byelarus are synonyms defined as:

White Russia and Byelarus: a landlocked republic in eastern Europe; formerly a European soviet

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

White Russia (noun)	Byelarus (noun)
a landlocked republic in eastern Europe; formerly a European soviet	a landlocked republic in eastern Europe; formerly a European soviet