Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Joerzéngt
←
German
Jahrzehnt
(derived)
←
Luxembourgish
Joer
(compound)
←
Luxembourgish
zéngt
(compound)