Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Germanic
*-ōzô
→
English
-er
(derived)
→
Middle Dutch
-er
(mention)
→
Gothic
-𐍉𐌶𐌰
(inherited)
→
Dutch
-er
(mention)
→
Swedish
-are
(derived)