Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
relustro
←
Catalan
llaucet
(cognate)
←
Proto-Celtic
*lowkstro-
(derived)
←
Proto-Celtic
*lowko-
(derived)
←
Welsh
lluched
(cognate)
←
Proto-Indo-European
*lewk-
(derived)
←
Latin
re-
(derived)
←
Latin
lūstrō
(mention)
←
Latin
lūstrum
(derived)
→
Galician
relustrar
(mention)