errand vs piece of work

errand

noun
  • A mundane mission of no great consequence, concerning household or business affairs (dropping items by, doing paperwork, going to a friend's house, etc.) 

  • An oral message trusted to a person for delivery. 

  • The purpose of such a journey. 

verb
  • To send someone on an errand. 

  • To go on an errand. 

piece of work

noun
  • A product or manufactured article, especially an item of art or craft. 

  • A person who has a strong and unusual personality, especially one with seriously unpleasant character flaws (e.g. a nasty piece of work). (This sense came about due to Hamlet’s soliloquy (see sense 1 above)). 

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