pants vs undies

pants

noun
  • An undergarment that covers the genitals and often the buttocks and the neighbouring parts of the body; underpants. 

  • Rubbish; something worthless. 

  • An outer garment that covers the body from the waist downwards, covering each leg separately, usually as far as the ankles; trousers. 

adj
  • Of inferior quality, rubbish. 

verb
  • To pull someone’s pants down; to forcibly remove someone’s pants. 

undies

noun
  • underwear, underpants 

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