mum vs voiceless

mum

adj
  • Silent. 

  • Secret. 

verb
  • To act in a pantomime or dumb show. 

intj
  • stop speaking!, stop talking!, hush! 

noun
  • Mother. 

  • A type of strong beer, originally made in Brunswick, Germany. 

  • A decoration made originally of a real chrysanthemum but now usually an artificial (silk) flower combined with ribbons and marked with such indicators as the wearer's name, school name, the year, and so on; traditionally worn by girls at high school homecoming celebrations. 

  • A chrysanthemum. 

voiceless

adj
  • Lacking a voice, without vocal sound. 

  • 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. 

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