Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Indo-European
*(H)rey-
→
Serbo-Croatian
река
(derived)
→
Serbo-Croatian
reka
(derived)
→
Serbo-Croatian
rijeka
(derived)
→
Serbo-Croatian
ријека
(derived)