Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
companheiro
←
Spanish
compañero
(cognate)
←
Portuguese
companha
(suffix)
←
Portuguese
eiro
(suffix)
←
Old Portuguese
companneiro
(mention)
→
Spanish
compañero
(cognate)