Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
erkennen
←
Old High German
irkennen
(inherited)
←
Luxembourgish
er-
(affix)
←
Luxembourgish
kennen
(affix)
→
Luxembourgish
unerkennen
(compound)
→
Swedish
erkänna
(cognate)