Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Eck
←
Old High German
egga
(derived)
→
Luxembourgish
Eckzant
(compound)
→
Luxembourgish
eckeg
(suffix)