Bucharesti vs Bucharest

Bucharesti and Bucharest both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bucharesti	Yes	No	No	No
Bucharest	Yes	No	No	No

As nouns, Bucharesti and Bucharest are synonyms defined as:

Bucharesti and Bucharest: national capital and largest city of Romania in southeastern Romania

Other synonyms of Bucharesti include Bucuresti, capital of Romania.

Bucharesti (noun)	Bucharest (noun)
national capital and largest city of Romania in southeastern Romania	national capital and largest city of Romania in southeastern Romania