Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Catalan
heptàgon
←
Ancient Greek
ἑπτάγωνον
(derived)
←
Latin
heptagonus
(derived)
→
Catalan
heptagonal
(suffix)