Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Serbo-Croatian
oštar
←
Proto-Indo-European
*h₂ḱrós
(derived)
←
Proto-Slavic
*ostrъ
(inherited)
→
Lithuanian
aštrus
(cognate)