Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Church Slavonic
простъ
←
Proto-Slavic
*prostъ
(inherited)
→
Old Church Slavonic
простость
(suffix)
→
Lower Sorbian
pšosty
(cognate)