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

→ Breton breur (inherited)
→ Welsh brawd (inherited)
→ Irish deartháir (derived)
→ Irish bráthair (inherited)
→ Scottish Gaelic bràthair (inherited)
→ Manx braar (inherited)
→ Cornish broder (inherited)
→ Old Irish bráthair (inherited)