motility vs stiffness

motility

noun
  • The state of being motile (moving) 

  • The degree to which something is motile 

stiffness

noun
  • inelegance; a lack of relaxedness. 

  • rigidity or a measure of rigidity. 

  • inflexibility or a measure of inflexibility. 

  • muscular tension due to unaccustomed or excessive exercise or work; soreness. 

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