Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Vietnamese thẳm
Lao ຖ້ຳ (cognate)
Proto-Tai *cramᶜ (cognate)
Thai ถ้ำ (cognate)

Vietnamese thăm thẳm (mention)
Vietnamese sâu thẳm (compound)