Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Faroese
fýra
←
Proto-Germanic
*fedwōr
(inherited)
←
Proto-Indo-European
*kʷetwṓr
(mention)
←
Proto-Indo-European
*kʷetwóres
(inherited)
←
Old Norse
fjórir
(inherited)
→
Icelandic
fjórir
(cognate)