Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Russian
пустой
←
Old East Slavic
поустъ
(inherited)
←
Proto-Slavic
*pustъ
(inherited)
→
Russian
попусту
(affix)