Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
roi
←
Czech
-
(cognate)
←
Serbo-Croatian
roj
(cognate)
←
Slovak
-
(cognate)
←
Proto-Slavic
*rojь
(derived)
→
Romanian
roiniță
(suffix)
→
Romanian
roire
(suffix)
→
Romanian
Roiu
(mention)