Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Lower Sorbian
ptašk
←
Czech
pták
(cognate)
←
Lower Sorbian
ptak
(mention)
←
Upper Sorbian
ptak
(cognate)
←
Proto-Indo-European
*peth₂-
(derived)
←
Polish
ptak
(cognate)
←
Russian
пта́шка
(cognate)
←
Serbo-Croatian
pátak
(cognate)
←
Proto-Slavic
*pъtakъ
(derived)
→
Lower Sorbian
ptaškowy
(suffix)