Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
reykja
←
Proto-Germanic
*raukijaną
(derived)
←
Icelandic
reykur
(link)
←
Icelandic
rjúka
(link)
←
Old Norse
reykja
(derived)
→
Icelandic
reyking
(suffix)
→
Luxembourgish
raachen
(cognate)