dipstick vs turncock

dipstick

noun
  • A stick or rod used to measure the depth of a liquid. Often used to check the level at which a liquid in an opaque or inaccessible tank or reservoir stands; gauge. 

  • A penis. 

  • A useless person of inferior intellect; a dipshit. 

verb
  • To check (a person) for their understanding of something, as of a lesson, or attitude toward something. 

  • To measure the level of a fluid using a dipstick. 

turncock

noun
  • A tap or faucet that regulates the flow of a fluid. 

  • A person employed to turn on the water for the mains, to regulate the fireplugs, etc. for a water company. 

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