Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Czech
věčný
←
Czech
věk
(suffix)
←
Czech
ný
(suffix)
←
Proto-Slavic
*věčьnъ
(inherited)
→
Czech
věčnost
(suffix)