Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
кост
←
Proto-Indo-European
*kost-
(derived)
←
Proto-Indo-European
*h₃ost-
(mention)
←
Proto-Slavic
*kostь
(inherited)
→
Bulgarian
костница
(affix)
→
Bulgarian
острица
(cognate)
→
Romanian
costeliv
(mention)