Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
tombo
←
Proto-Celtic
*tumbos
(derived)
←
Irish
tom
(cognate)
←
Galician
tombar
(back-formation)
←
Galician
tumbio
(link)
←
Ancient Greek
τύμβος
(derived)