Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Low German
rüken
←
Proto-Germanic
*reukaną
(inherited)
←
Proto-West Germanic
*reukan
(inherited)
←
Old Saxon
*rūkan
(inherited)
→
English
reek
(cognate)