Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
płat
←
Proto-Slavic
*platъ
(inherited)
→
Polish
płatek
(suffix)
→
Polish
płatowiec
(affix)
→
Russian
плат
(cognate)