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

→ English down (derived)
→ English town (derived)
→ English Edinburgh (derived)
→ English dun (derived)
→ English Salisbury (derived)
→ English Merlin (mention)
→ English Thun (derived)
→ Afrikaans tuin (derived)
→ Afrikaans duin (derived)
→ Old English dun (derived)
→ Old English -tun (derived)
→ Gaulish dune (inherited(cel-gau/en))
→ Gaulish dunon (inherited)
→ Welsh din (inherited)
→ Welsh dinas (inherited)
→ Welsh Caerfyrddin (mention)
→ Danish tun (derived)
→ German Zaun (derived)
→ Middle English toun (derived)
→ Faroese tún (derived)
→ Irish dún (inherited)
→ Scottish Gaelic dùn (inherited)
→ Manx doon (inherited)
→ Icelandic tún (derived)
→ Italian duna (derived)
→ Latin Camulodunum (mention)
→ Latin Lugdunum (mention)
→ Latin Eburodunum (mention)
→ Latin Moridunum (mention)
→ Latin Campodunum (mention)
→ Latin Noviodunum (mention)
→ Latin Uxellodunum (mention)
→ Dutch tuin (derived)
→ Dutch duin (derived)
→ Old Norse tún (derived)
→ Old Irish dún (inherited)