Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old High German
garo
←
Proto-West Germanic
*garu
(inherited)
→
German
gar
(inherited)
→
German
garen
(derived)
→
Old High German
garwen
(mention)
→
Luxembourgish
guer
(derived)