Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Indo-European
*kom
→
Scottish Gaelic
coma
(mention)
→
Polish
ku
(inherited)
→
Serbo-Croatian
k
(inherited)
→
Serbo-Croatian
к
(derived)