Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Indo-European *kost-

→ English coaster (root)
→ English coaster (derived)
→ English coast (root)
→ English coast (derived)
→ Bulgarian кост (derived)
→ Catalan costa (derived)
→ Czech kost (derived)
→ Old Church Slavonic кость (derived)
→ Lower Sorbian kósć (derived)
→ Spanish cuesta (derived)
→ Spanish entrecot (derived)
→ French côte (derived)
→ Galician costa (derived)
→ Upper Sorbian kósć (derived)
→ Italian costa (derived)
→ Latin costa (derived)
→ Polish kość (mention)
→ Polish kuesta (derived)
→ Portuguese costa (derived)
→ Portuguese costas (derived)
→ Romanian coastă (derived)
→ Russian кость (inherited)
→ Rusyn кість (inherited)
→ Serbo-Croatian кост (derived)
→ Serbo-Croatian kost (derived)
→ Slovak kosť (derived)
→ Old Czech kost (derived)