Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Estonian
-kas
←
Finnish
-kas
(cognate)
←
Proto-Finnic
*-k'as
(inherited)
→
Estonian
punakas
(affix)
→
Ingrian
-kas
(cognate)