Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Kaul
←
German
Kaule
(cognate)
←
Middle High German
kūle
(inherited)
→
German
Kuhle
(cognate)