Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-West Germanic
*þauh
→
Old English
þeah
(inherited)
→
German
doch
(derived)
→
Old High German
doh
(inherited)
→
Luxembourgish
dach
(inherited)
→
Dutch
doch
(inherited)