Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
eahtian
←
Proto-West Germanic
*ahtōn
(inherited)
→
English
ettle
(derived)
→
Old English
geæhtle
(mention)
→
Old Saxon
ahton
(cognate)