Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Tamil
தெரு
←
Malayalam
തെരുവ്
(cognate)
←
Telugu
తెరువు
(cognate)
→
Tamil
தெருக்கூத்து
(compound)