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

→ Breton gour (inherited)
→ Welsh gŵr (inherited)
→ Irish fear (inherited)
→ Scottish Gaelic fear (inherited)
→ Manx fer (inherited)
→ Primitive Irish fer (inherited(pgl/mga))
→ Primitive Irish fer (inherited(pgl/sga))
→ Middle Welsh gwr (inherited)