Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Belarusian
восемдзесят
←
Belarusian
восем
(compound)
←
Belarusian
дзесяць
(compound)
←
Old Church Slavonic
осмь дєсѧтъ
(cognate)
←
Russian
во́семьдесят
(cognate)
←
Ukrainian
вісімдеся́т
(cognate)