Union of Burma vs Burma

Union of Burma and Burma both are nouns.

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

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

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

Other synonyms of Union of Burma include Myanmar.

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