Burma vs Union of Burma

Burma and Union of Burma both are nouns.

Word	Noun	Adjective	Verb	Adverb
Burma	Yes	No	No	No
Union of Burma	Yes	No	No	No

As nouns, Burma and Union of Burma are synonyms defined as:

Burma and Union of Burma: a mountainous republic in southeastern Asia on the Bay of Bengal

Other synonyms of Burma include Myanmar.

Burma (noun)	Union of Burma (noun)
a mountainous republic in southeastern Asia on the Bay of Bengal	a mountainous republic in southeastern Asia on the Bay of Bengal