Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Czech
tuk
←
Proto-Slavic
*tukъ
(inherited)
→
Czech
tukový
(affix)
→
Lower Sorbian
tucne
(cognate)