motility vs tendency

motility

noun
  • The state of being motile (moving) 

  • The degree to which something is motile 

tendency

noun
  • A likelihood of behaving in a particular way or going in a particular direction; a tending toward. 

  • An organised unit or faction within a larger political organisation. 

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