Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
planular
←
Proto-Indo-European
*pleh₂-
(root)
←
Proto-Indo-European
*pleh₂-
(derived)
←
Latin
plānus
(derived)