Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Northern Puebla Nahuatl
metztli
←
Classical Nahuatl
metztli
(derived)
→
Central Huasteca Nahuatl
metzti
(cognate)