Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Old Irish cuil
← Proto-Celtic *kulis (inherited)
← Proto-Indo-European *ḱuH-ló- (inherited)

→ Welsh cylion (cognate)
→ Irish cúil (inherited)
→ Irish cuil (inherited)
→ Scottish Gaelic cùil (inherited)
→ Scottish Gaelic cuileag (derived)
→ Manx quill (inherited)