boots vs skivvy

boots

noun
  • A condom. 

  • The ship in a fleet having the most junior captain. 

skivvy

noun
  • A prostitute. 

  • A close-fitting, long-sleeved T-shirt with a rolled collar. 

verb
  • To perform menial work; to do chores, like a servant. 

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