Proto-Slavic *sǫmorkъ

→ Belarusian змрок (derived)

→ Bulgarian сумрак (inherited)

→ Czech soumrak (inherited)

→ Old Church Slavonic съмръкнѫти (inherited)

→ Macedonian самрак (inherited)

→ Polish zmrok (inherited)

→ Russian сумерки (derived)

→ Russian сумрак (derived)

→ Serbo-Croatian сумрак (inherited)