pinch hitter vs senator

pinch hitter

noun
  • A substitute batter; one who pinch-hits. 

  • An aggressive batsman brought on to score runs quickly, even at the risk of losing his wicket. 

  • An individual who substitutes for another to perform one or more tasks. 

senator

noun
  • A member of the ruler’s council or governing council in general, a leading statesman. 

  • A member, normally elected, in the house or chamber of a legislature called a senate, as, for instance, the legislatures of the United States and Canada. 

  • A member of the ancient Roman Senate. 

  • A member of a governing council in other states in the ancient world. 

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