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

→ English flat (derived)
→ English flet (inherited)
→ Old English flet (inherited)
→ Old English flett (inherited)
→ Middle English flet (inherited)
→ Finnish lattia (derived)
→ Old Norse flet (inherited)