Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*oměgъ
→
Bulgarian
мангуна
(derived)
→
Czech
oměj
(inherited)
→
Czech
voměj
(inherited)
→
Polish
omieg
(inherited)
→
Russian
омег
(inherited)