Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Assamese
চতুৰ্থ
←
Sanskrit
चतुर्थ
(borrowed)
→
Assamese
চ’থা
(doublet)
→
Assamese
চৌথা
(doublet)