Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Mon-Khmer
*cʔaʔ
→
Khmer
ស្អាត
(inherited)
→
Lao
ສະອາດ
(derived)
→
Mon
သ္အး
(inherited)
→
Thai
สะอาด
(derived)