Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Fläiss
←
German
Fleiß
(cognate)
←
Old High German
flīz
(inherited)
←
Dutch
vlijt
(cognate)
→
Luxembourgish
fläisseg
(suffix)