Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
conjecturable
←
English
conjecture
(suffix)
←
English
able
(suffix)
→
English
unconjecturable
(prefix)
→
English
conjecturably
(suffix)