Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Icelandic flakka
Proto-Germanic *flakkōn (inherited)
Ancient Greek πλάζω (cognate)
Proto-Indo-European *pleḱ- (inherited)
Old Norse flakka (inherited)

English flack (cognate)
English flacker (cognate)
Icelandic flakk (mention)
Icelandic flakkari (affix)