Republic of Lithuania vs Lietuva

Republic of Lithuania and Lietuva both are nouns.

Word	Noun	Adjective	Verb	Adverb
Republic of Lithuania	Yes	No	No	No
Lietuva	Yes	No	No	No

As nouns, Republic of Lithuania and Lietuva are synonyms defined as:

Republic of Lithuania and Lietuva: a republic in northeastern Europe on the Baltic Sea, with capital Vilnius

Other synonyms of Republic of Lithuania include Lithuania.

Republic of Lithuania (noun)	Lietuva (noun)
a republic in northeastern Europe on the Baltic Sea, with capital Vilnius	a republic in northeastern Europe on the Baltic Sea, with capital Vilnius