Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Luxembourgish
aarm
←
German
arm
(cognate)
←
Proto-Germanic
*armaz
(derived)
←
Old High German
arm
(derived)
←
Icelandic
armur
(cognate)
←
Dutch
arm
(cognate)