Lithuania vs Lietuva

Lithuania and Lietuva both are nouns.

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

As nouns, Lithuania and Lietuva are synonyms defined as:

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

Other synonyms of Lithuania include Republic of Lithuania.

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