Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
czerwiec
→
Polish
czerwcowy
(suffix)
→
Polish
Czerwiec
(mention)
→
Russian
червень
(cognate)
→
Ukrainian
червень
(cognate)