Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Kapp
←
German
Kopf
(cognate)
←
English
cop
(cognate)
←
West Frisian
kop
(cognate)
←
Proto-West Germanic
*kopp
(inherited)
←
Old High German
kopf
(inherited)
←
Dutch
kop
(cognate)
→
Hunsrik
Kopp
(cognate)
→
Luxembourgish
käppen
(suffix)
→
Luxembourgish
Kappball
(compound)