Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Portuguese
espelho
←
Proto-Indo-European
*speḱ-
(derived)
←
Latin
speculum
(inherited)
←
Latin
speciō
(mention)
←
Portuguese
espéculo
(doublet)
←
Old Portuguese
espello
(inherited)
→
Galician
espello
(cognate)
→
Portuguese
espelhar
(suffix)