Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
seio
←
Spanish
seno
(cognate)
←
French
sein
(cognate)
←
Latin
sinus
(inherited)
←
Old Portuguese
sẽo
(inherited)
→
French
sein
(cognate)
→
Portuguese
seno
(doublet)
→
Portuguese
enseada
(confix)