ironing vs mopping

ironing

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

  • The act of pressing clothes with an iron. 

  • Laundry that has recently been ironed. 

mopping

noun
  • The process of cleaning with a mop. 

  • An application of molten asphalt to a roof etc. 

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