inarticulate vs voiceless

inarticulate

adj
  • not articulated in normal words. 

  • unable to speak with any clarity 

  • speechless 

  • not having joints or other articulations 

noun
  • An animal belonging to the subphylum Inarticulata. 

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