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.
Serbo-Croatian
Serbo-Croatian (; / also called Serbo-Croat , Serbo-Croat-Bosnian (SCB), Bosnian-Croatian-Serbian (BCS), or Bosnian-Croatian-Montenegrin-Serbian (BCMS)) is a South Slavic language and the primary language of Serbia, Croatia, Bosnia and Herzegovina, and Montenegro. It is a pluricentric language with four mutually intelligible standard varieties.