Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
искоусъ
←
Proto-Slavic
*kusъ
(inherited)
→
Old Church Slavonic
искоусьникъ
(suffix)
→
Russian
искусство
(mention)