pilot officer vs vice

pilot officer

noun
  • The lowest rank of a commissioned officer in the RAF, equivalent to an Army ensign or coronet 

vice

noun
  • One who acts in place of a superior. 

  • A winding or spiral staircase. 

  • A bad habit. 

  • A tool for drawing lead into cames, or flat grooved rods, for casements. 

  • Any of various crimes related (depending on jurisdiction) to weapons, prostitution, pornography, gambling, alcohol, tobacco, or drugs. 

  • A defect in the temper or behaviour of a horse, such as to make the animal dangerous, to injure its health, or to diminish its usefulness. 

adj
  • in place of; subordinate to; designating a person below another in rank 

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