Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Hunsrik
Knopp
←
Proto-Germanic
*knuppô
(inherited)
←
Proto-Germanic
*knappô
(mention)
←
Proto-Germanic
*knappa-
(mention)
←
Proto-West Germanic
*knappō
(mention)
←
Old High German
knopf
(inherited)
←
Luxembourgish
Knapp
(cognate)
→
German
Knopf
(cognate)