Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Haaptfach
←
German
Hauptfach
(derived)
←
Luxembourgish
haapt-
(affix)
←
Luxembourgish
Fach
(affix)