Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Morelos Nahuatl
masatl
←
Proto-Nahuan
*masaatl
(inherited)
→
Tetelcingo Nahuatl
masötl
(cognate)