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.
Bosniaks
Bosniaks speak the Bosnian language, a South Slavic language of the Western South Slavic subgroup. Standard Bosnian is considered a variety of "Serbo-Croatian", as mutually intelligible with the Croatian and Serbian languages (see Differences in standard Serbian, Croatian and Bosnian) which are all based on the Shtokavian dialect. As such, "Serbo-Croatian" is an arbitrary term applied to a language spoken by several ethnic groups, including the Bosniaks, and is for various reasons controversial for native speakers who do not use the term. As result, paraphrases such as "Serbo-Croat-Bosnian (SCB)" or "Bosnian/Croatian/Serbian (BCS)" tend to be used in English on occasion.