Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*-a
→
Lithuanian
-o
(cognate)
→
Romanian
bolniță
(affix)
→
Russian
-а
(inherited)
→
Serbo-Croatian
-a
(inherited)
→
Serbo-Croatian
-а
(inherited)