Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
eldritch
←
Old English
rīċe
(derived)
←
Old English
ellende
(cognate)
→
English
eldritchly
(suffix)
→
English
eldritchness
(suffix)
→
Old English
el-
(cognate)