Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Cornish -en

→ Breton -enn (cognate)
→ Welsh -en (cognate)
→ Cornish kennen (affix)
→ Cornish knowen (affix)
→ Cornish pluven (affix)
→ Old Irish -ne (cognate)