Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
czwartek
←
Polish
czwarty
(suffix)
←
Polish
ek
(suffix)
←
Polish
(suffix)
←
Proto-Slavic
*četvьrtъkъ
(inherited)
→
Polish
Czwartek
(mention)