Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Gäertner
←
German
Gärtner
(cognate)
←
English
gardener
(cognate)
←
Middle High German
gertner
(inherited)
←
Luxembourgish
Gaart
(affix)
←
Luxembourgish
-er
(affix)