Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Estonian
kaheksa
←
Proto-Finnic
*kakteksa
(inherited)
→
Estonian
kaheksateist
(compound)
→
Ingrian
kaheksan
(cognate)
→
Karelian
kaheksan
(cognate)