Slavs
Standardised Slavic languages that have official status in at least one country are: Belarusian, Bosnian, Bulgarian, Croatian, Czech, Macedonian, Montenegrin, Polish, Russian, Serbian, Slovak, Slovene, and Ukrainian.
Yugoslavs
Yugoslavs or Yugoslavians (Serbo-Croatian: "Jugoslaveni/"Југославени, "Jugosloveni/"Југословени; Macedonian: Југословени; Slovene: "Jugoslovani") is a designation that was originally designed to refer to a united South Slavic people. It has been used in two connotations, the first in an ethnic or supra-ethnic connotation, and the second as a term for citizens of the former Yugoslavia. Cultural and political advocates of Yugoslav identity have historically ascribed the identity to be applicable to all people of South Slav heritage, including those of today's Bosnia and Herzegovina, Bulgaria, Croatia, Macedonia, Montenegro, Serbia, and Slovenia. Attempts at uniting Bulgaria into Yugoslavia were however unsuccessful and therefore Bulgarians were not included in the panethnic identification.