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

→ English fern (mention)
→ Old English fearn (derived)
→ Welsh rhedyn (inherited)
→ German Farn (mention)
→ Lower Sorbian paproś (derived)
→ Old Irish raithnech (inherited)
→ Albanian fier (derived)