Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
unknown
←
Old English
ungecnawen
(cognate)
←
English
un
(prefix)
←
English
known
(prefix)
←
English
know
(mention)
→
English
unknome
(suffix)
→
English
unknownness
(suffix)
→
English
person unknown
(link)
→
Portuguese
canto
(link)