eraser vs mop

eraser

noun
  • A thing used to erase or remove something written or drawn by a pen or a pencil. 

  • A thing used to erase something written by chalk on a chalkboard, by marker on a whiteboard, or by some other erasable implement; a chalkboard eraser, whiteboard eraser, etc. 

  • One who erases. 

  • An overwriter program used to prevent data recovery. 

mop

noun
  • A wash with a mop; the act of mopping. 

  • An implement for washing floors or similar, made of a piece of cloth, or a collection of thrums, or coarse yarn, fastened to a handle. 

  • A dense head of hair. 

  • A made-up face; a grimace. 

  • A firearm particularly if it has a large magazine (compare broom, but still can be related to MP) 

verb
  • To shoplift. 

  • To rub, scrub, clean or wipe with a mop, or as if with a mop. 

  • To make a wry expression with the mouth. 

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