Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Icelandic
þrjóskur
←
Proto-Germanic
*þreutskaz
(inherited)
←
Old Norse
þrjózkr
(inherited)
→
Icelandic
þrár
(link)
→
Swedish
tredsk
(cognate)