Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Germanic
*blakaz
→
English
black
(inherited)
→
English
blatch
(derived)
→
Old English
blæc
(inherited)
→
Middle English
blak
(inherited)