Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
sécher
←
Middle High German
sicher
(inherited)
←
Proto-West Germanic
*sikur
(inherited)
←
Old High German
sihhur
(inherited)
←
Latin
sēcūrus
(derived)
→
Luxembourgish
Sécherheet
(suffix)