blackball vs induct

blackball

noun
  • A black ball used to indicate such a negative vote. 

  • A rejection; a vote against admitting someone. 

  • A kind of large black sweet; a niggerball. 

  • A game, a standardized version of the English version of eight-ball. 

  • A substance for blacking shoes, boots, etc. or for taking impressions of engraved work. 

verb
  • To ostracize. 

  • To vote against, especially in an exclusive organization. 

induct

verb
  • To draft into military service. 

  • To formally or ceremoniously install in an office, position, etc. 

  • To introduce into (particularly if certain knowledge or experience is required, such as ritual adulthood or cults). 

  • To bring in as a member; to make a part of. 

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