Proto-Slavic *osa

→ Belarusian аса (inherited)

→ Bulgarian оса (inherited)

→ Czech vosa (inherited)

→ Lower Sorbian wósa (inherited)

→ Upper Sorbian wosa (inherited)

→ Latvian apse (cognate)

→ Macedonian оса (inherited)

→ Polish osa (inherited)

→ Russian оса (inherited)

→ Serbo-Croatian osa (inherited)

→ Serbo-Croatian оса (inherited)

→ Slovak osa (inherited)

→ Slovene osa (inherited)

→ Ukrainian оса (inherited)