Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Belarusian
верасень
←
Polish
wrzesień
(cognate)
←
Ukrainian
ве́ресень
(cognate)
→
Polish
wrzesień
(cognate)
→
Russian
вересень
(cognate)