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

→ Breton bed (inherited)
→ Welsh byd (inherited)
→ Irish bith (inherited)
→ Cornish bes (inherited)
→ Cornish bys (inherited)
→ Latin Burdigala (derived)
→ Latin Bituriges (compound)
→ Old Irish bith (inherited)