Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Äerz
←
German
Erz
(cognate)
←
Proto-Germanic
*aruts
(inherited)
←
Old High German
aruz
(inherited)
→
Alemannic German
Ärzt
(cognate)