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

→ Welsh pellter (affix)
→ Welsh melyster (affix)
→ Welsh anghofuster (suffix)
→ Welsh anhawster (affix)
→ Welsh -terau (compound)