Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
West Frisian
tsjêf
←
Proto-Germanic
*kafą
(inherited)
←
Old Frisian
*zaf
(inherited)
→
English
chaff
(cognate)
→
Luxembourgish
Kuef
(cognate)
→
Dutch
kaf
(mention)