Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Vietnamese khoai
Proto-Mon-Khmer *kwaaj (derived)
Mal - (cognate)
Mon ကွဲာ (cognate)

Vietnamese khoai tây (compound)
Vietnamese khoai sọ (mention)
Vietnamese khoai môn (mention)
Vietnamese khoai mì (compound)