Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Bouf
←
German
Bube
(cognate)
←
Middle High German
buobe
(inherited)
←
Dutch
boef
(cognate)
→
Luxembourgish
Béifchen
(affix)