ironing vs underwear

ironing

noun
  • The act of pressing clothes with an iron. 

  • Laundry that has been washed and is ready to be ironed. 

  • Laundry that has recently been ironed. 

underwear

noun
  • Clothes worn next to the skin, underneath outer clothing. 

  • Underpants (boxers, briefs, panties, etc) and often bras. 

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