voiced vs voiceless

voiced

adj
  • That contains voice. 

  • Sounded with vibration of the vocal cords. For example, the phone [z] is voiced, while [s] is unvoiced. 

  • Having a specified kind of voice. 

voiceless

adj
  • Spoken without vibration of the vocal cords; unvoiced, surd, breathed. Examples: [t], [s], [f], [m̥], [u̥]. 

  • Without a vote; having no input into a decision. 

  • Lacking a voice, without vocal sound. 

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