Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
degrau
←
Proto-Indo-European
*gʰredʰ-
(inherited)
←
Latin
gradus
(inherited)
←
Old Portuguese
degraao
(inherited)
→
Portuguese
-s
(mention)