Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Serbo-Croatian
jednjak
←
Serbo-Croatian
jedem
(suffix)
←
Serbo-Croatian
njak
(suffix)
←
Proto-Slavic
* jědьnjakъ
(inherited)