Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Jeju
섣ᄃᆞᆯ
←
Korean
섣달
(cognate)
←
Middle Korean
섯ᄃᆞᆯ
(derived)