Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Welsh deddf
← Ancient Greek θεσμός (cognate)
← Proto-Indo-European *dʰh₁-dʰmó-s (derived)
← Proto-Indo-European *dʰeh₁- (mention)

→ Welsh cynneddf (affix)
→ Welsh deddflyfr (affix)
→ Welsh deddfol (affix)
→ Welsh deddfu (affix)
→ Ancient Greek θεσμός (cognate)