Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Finnish
-ehtoinen
←
Finnish
ehto
(suffix)
←
Finnish
inen
(suffix)
→
Finnish
vapaaehtoinen
(compound)
→
Finnish
omaehtoinen
(compound)
→
Finnish
valaehtoinen
(compound)
→
Finnish
-ehtoisesti
(suffix)
→
Finnish
-ehtoisuus
(suffix)