Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
English known
Old English cnāwen (inherited)
English know (suffix)
English n (suffix)
Middle English knowen (inherited)

English unknown (prefix)
English beknown (prefix)
English f/k/a (mention)
English underknown (prefix)
English knownness (suffix)
English knownless (suffix)
English aforeknown (prefix)