sir vs swab

sir

noun
  • to a superior military officer. 

  • A man of a higher rank or position. 

  • to a teacher. 

  • to a knight or other low member of the peerage. 

  • A respectful term of address to a man of higher rank or position 

  • A respectful term of address to an adult male (often older), especially if his name or proper title is unknown. 

verb
  • To address (someone) using "sir". 

swab

noun
  • A naval officer's epaulet. 

  • A sailor; a swabby. 

  • A small piece of soft, absorbent material, such as gauze, used to clean wounds, apply medicine, or take samples of body fluids. Often attached to a stick or wire to aid access. 

  • A mop, especially on a ship. 

  • A piece of material used for cleaning or sampling other items like musical instruments or guns. 

  • A sample taken with a swab (piece of absorbent material). 

verb
  • To use a swab on something, or clean something with a swab. 

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