Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Slavic *obolkъ

→ Belarusian воблака (derived)
→ Bulgarian облак (inherited)
→ Czech oblak (inherited)
→ Old Church Slavonic облакъ (inherited)
→ Macedonian облак (inherited)
→ Polish obłok (inherited)
→ Russian облако (derived)
→ Serbo-Croatian облак (inherited)
→ Serbo-Croatian oblak (inherited)
→ Slovene oblak (inherited)