Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
North Frisian
füft
←
West Frisian
fyfte
(cognate)
←
Low German
füfte
(derived)
←
Old Frisian
fīfta
(derived)