Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Bulgarian
рад
←
Proto-Slavic
*radъ
(inherited)
→
Bulgarian
радост
(affix)
→
Bulgarian
Рада
(cognate)
→
Bulgarian
радвам
(affix)
→
Bulgarian
Радой
(affix)