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

→ Bulgarian лук (inherited)
→ Old Church Slavonic лоукъ (inherited)
→ Macedonian лук (inherited)
→ Old Norse laukr (cognate)
→ Polabian lauk (inherited)
→ Russian лук (inherited)
→ Serbo-Croatian лук (inherited)
→ Serbo-Croatian luk (inherited)