Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old High German
zisamane
→
German
zusammen
(inherited)
→
Alemannic German
zäme
(derived)
→
Luxembourgish
zesummen
(derived)