Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
uechten
←
German
achten
(cognate)
←
Middle High German
ahten
(inherited)
←
Old High German
ahtōn
(inherited)
←
Dutch
achten
(cognate)
→
Luxembourgish
beuechten
(affix)
→
Luxembourgish
veruechten
(affix)