Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Prussian
attolis
←
Proto-Indo-European
*h₂et-
(derived)
←
Lithuanian
atolas
(cognate)
→
Lithuanian
atolas
(cognate)