Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*rōþr
→
English
rudder
(inherited)
→
Old English
roþor
(inherited)
→
Saterland Frisian
Ruur
(inherited)