serving vs trencher

serving

noun
  • An instance of that act or process; also (usually, especially) the amount of food or drink for or served to one person; especially in relation to a meal. 

  • A layer added to the outside of an electrical cable to protect it. 

  • The act or process of serving. 

trencher

noun
  • A plate on which food is served and/or cut. 

  • A machine for digging trenches. 

  • One who trenches; especially, one who cuts or digs ditches. 

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