Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
taină
←
Bulgarian
тайна
(cognate)
←
Czech
tajemství
(cognate)
←
Old Church Slavonic
таина
(borrowed)
←
Polish
tajemnica
(cognate)
←
Russian
тайна
(cognate)
←
Serbo-Croatian
tajna
(cognate)
→
Romanian
tăinui
(suffix)
→
Romanian
Taină
(mention)