Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Welsh cof
← Proto-Celtic *kom- (inherited)
← Proto-Indo-European *men- (inherited)

→ Welsh cofio (affix)
→ Welsh cofnod (affix)
→ Welsh angof (prefix)
→ Welsh cofbin (compound)
→ Welsh atgoffa (suffix)
→ Welsh cofrestr (affix)