articulate vs voiceless

articulate

noun
  • An animal of the subkingdom Articulata. 

adj
  • Speaking in a clear and effective manner. 

  • Distinctly marked off. 

  • Clear; effective. 

  • Consisting of segments united by joints. 

verb
  • To bend or hinge something at intervals, or to allow or build something so that it can bend. 

  • To make clear or effective. 

  • To explain; to put into words; to make something specific. 

  • To speak clearly; to enunciate. 

  • to form a joint or connect by joints 

  • to attack a note, as by tonguing, slurring, bowing, etc. 

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 articulate and voiceless occurred in a corpus of books? (source: Google Ngram Viewer )