Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
stjúp
→
Icelandic
stjúpsonur
(prefix)
→
Icelandic
stjúpdóttir
(prefix)
→
Icelandic
stjúpmóðir
(prefix)
→
Icelandic
stjúpfaðir
(prefix)
→
Icelandic
stjúpbarn
(prefix)
→
Norwegian Nynorsk
styk-
(cognate)