Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
blëtzen
←
German
blitzen
(cognate)
←
Middle High German
bleczen
(inherited)
←
Proto-West Germanic
*blikkattjan
(inherited)
←
Old High German
bleckezzen
(inherited)
→
Luxembourgish
Blëtz
(mention)