Byelarus vs Belarus

Byelarus and Belarus both are nouns.

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

As nouns, Byelarus and Belarus are synonyms defined as:

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

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

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