Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Frisian
helpe
→
West Frisian
help
(inherited)
→
Old Frisian
helpwunde
(compound)
→
Old Frisian
helpere
(affix)
→
Saterland Frisian
Hälpe
(inherited)