Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Slovak
ortuť
←
Polish
rtęć
(cognate)
←
Russian
ртуть
(cognate)
←
Proto-Slavic
*rьtǫtь
(inherited)