Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Proto-Indo-European *léwksmn̥

→ Catalan llum (inherited)
→ Italian lume (inherited)
→ Latin lumen (inherited)
→ Occitan lum (inherited)
→ Portuguese lume (inherited)
→ Romansch glüm (inherited)
→ Romanian lume (derived)