Proto-Slavic *kolsъ

→ Belarusian колас (inherited)

→ Bulgarian клас (inherited)

→ Czech klas (inherited)

→ Upper Sorbian kłosa (inherited)

→ Hungarian kalász (derived)

→ Macedonian клас (inherited)

→ Polish kłos (inherited)

→ Polabian klås (inherited)

→ Russian клас (derived)

→ Serbo-Croatian klas (inherited)

→ Serbo-Croatian клас (inherited)

→ Slovak klas (inherited)

→ Slovene klas (inherited)