Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
ruczaj
←
Proto-Slavic
*ručajь
(inherited)
←
Proto-Slavic
*ručati
(mention)
→
Polish
Ruczaj
(mention)
→
Russian
ручей
(cognate)