Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
polymathy
←
English
polymath
(suffix)
←
English
y
(suffix)
←
English
polymath
(mention)
←
Ancient Greek
πολυμαθής
(mention)
→
English
polymath
(mention)