facultative vs voting

facultative

adj
  • That grants permission or power to do something. 

  • Able to perform a particular life function, or to live generally, in more than one way. 

  • Of or relating to faculty, especially to mental faculty. 

  • Not obligate; optional, discretionary or elective. 

  • At which a given function is positive. 

voting

adj
  • Having an associated right for the holder to vote as an owner of business. 

noun
  • action of the verb to vote 

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