phonetic vs unwritten

phonetic

adj
  • Relating to the spoken rather than written form of a word or name, as opposed to orthographic. 

  • Relating to phones (as opposed to phonemes). 

  • Relating to the sounds of spoken language. 

noun
  • In such writing systems as the Chinese writing system, the portion of a phono-semantic character that provides an indication of its pronunciation; contrasted with semantic (which is usually the radical). 

unwritten

adj
  • Oral or otherwise communicated without writing. 

  • Not written. 

  • Implicit or understood but not formally articulated. 

  • Containing no writing; blank. 

How often have the words phonetic and unwritten occurred in a corpus of books? (source: Google Ngram Viewer )