Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Breton penn
← Proto-Brythonic *penn (inherited)
← Proto-Celtic *kʷennom (inherited)

→ Breton pennoù (suffix)
→ Breton pemoc'h (compound)
→ Irish ceann (cognate)
→ Scottish Gaelic ceann (cognate)
→ Old Irish cenn (cognate)