Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Ukrainian
оптимальний
←
Belarusian
аптыма́льны
(cognate)
←
Latin
optimus
(derived)
←
Polish
optymalny
(cognate)
←
Russian
оптима́льный
(cognate)