Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Romanian
Trestenic
←
Bulgarian
Тръстеник
(cognate)
←
Old Church Slavonic
тръстеникъ
(borrowed)
←
Old Church Slavonic
тръсть
(mention)