Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old English
eorcnan
←
Proto-Germanic
*erknaz
(inherited)
←
Old High German
erchan
(cognate)
→
Old English
eorcnanstan
(compound)
→
Old High German
erchan
(mention)