Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Saxon
undargangan
←
Old Saxon
undar
(prefix)
←
Old Saxon
gan
(prefix)
→
Old English
undergan
(mention)
→
Old English
undergangan
(cognate)