Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
greși
←
Proto-Slavic
*grěšiti
(derived)
→
Romanian
greșeală
(mention)
→
Romanian
greș
(back-formation)
→
Romanian
greșit
(mention)