Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Yoron
黒さん
←
Proto-Japonic
*kuro
(inherited)
←
Proto-Ryukyuan
*kuro
(inherited)
→
Okinawan
黒さん
(cognate)