Montenegrin (Montenegrin) and Serbian (Serbian) are two of the four national standards of the Štokavian South Slavic language commonly referred to as BCMS (Bosnian–Croatian–Montenegrin–Serbian). Everyday speech is largely mutually intelligible; the standards differ in orthography, lexical preferences, and official status.
Crnogorski
The most recently codified BCMS national standard, declared official in Montenegro in 2007. Distinguished from Serbian by the recognition of two additional Montenegrin-specific letters and a number of lexical preferences.
Srpski · Standard Serbian
The Belgrade-based standard of Serbian. Part of the Štokavian dialect continuum that underlies all four BCMS national standards (Bosnian, Croatian, Montenegrin, Serbian); written in both Cyrillic and Latin scripts.
Open Montenegrin and Serbian individually, or read about the other BCMS standards.