Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
arreo
←
Catalan
arreu
(cognate)
←
Proto-Germanic
*rēdaz
(derived)
←
Galician
a
(mention)
→
Catalan
arreu
(cognate)