Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
-er
←
Latin
-ēre
(inherited)
←
Latin
-ere
(mention)
←
Portuguese
-ir
(mention)
←
Old Portuguese
-er
(inherited)