Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Kascht
←
German
Kost
(cognate)
←
Middle High German
koste
(inherited)
←
Old High German
kosta
(inherited)
←
Luxembourgish
kaschten
(mention)