Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Stiermer
←
German
Stürmer
(cognate)
←
Luxembourgish
Stuerm
(affix)
←
Luxembourgish
-er
(affix)