Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
ac
←
Proto-Indo-European
*h₂eḱ-
(derived)
←
Latin
acus
(inherited)
→
Italian
ago
(cognate)
→
Romanian
acar
(affix)
→
Romanian
acușor
(suffix)
→
Romanian
acarniță
(suffix)
→
Romanian
acăriță
(suffix)
→
Aromanian
ac
(cognate)