Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Esperanto
helpi
←
Old English
helpan
(mention)
←
English
help
(mention)
←
Proto-Germanic
*helpaną
(mention)
←
Proto-Indo-European
*ḱelp-
(mention)
→
Esperanto
help
(mention)
→
Esperanto
malhelpi
(prefix)
→
Esperanto
helpverbo
(affix)
→
Esperanto
malhelpo
(affix)