Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Polish
ęcy
→
Polish
źrebięcy
(suffix)
→
Polish
cielęcy
(suffix)
→
Polish
książęcy
(suffix)
→
Polish
chłopięcy
(suffix)
→
Polish
dziewczęcy
(suffix)
→
Polish
arcyksiążęcy
(suffix)