Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
Ënnergang
←
Luxembourgish
ënner-
(affix)
←
Luxembourgish
Gang
(affix)
→
German
Untergang
(cognate)
→
Luxembourgish
Sonnenënnergang
(affix)