Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*tǫča
→
Bulgarian
туча
(inherited)
→
Polish
tęcza
(inherited)
→
Polabian
tǫco
(inherited)
→
Serbo-Croatian
tuča
(inherited)