forager vs gatherer

forager

noun
  • An animal or person who forages 

gatherer

noun
  • A person who collects rent or taxes. 

  • A person who gathers things. 

  • A workman who collects molten glass on the end of a rod preparatory to blowing. 

  • An attachment to a sewing machine for making gathers in the cloth. 

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