Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Slavic
*trьvoga
→
Bulgarian
тревога
(inherited)
→
Macedonian
тревога
(inherited)
→
Polish
trwoga
(inherited)
→
Russian
тревога
(derived)