Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
rō
→
English
roo
(inherited)
→
German
Ruhe
(cognate)
→
Middle English
roo
(inherited)
→
Middle English
ro
(inherited)