gatherer vs pack rat

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. 

pack rat

noun
  • One who collects or hoards, especially unnecessary things. 

  • Any of several small North American rodents, of the genus Neotoma, that have bushy tails. 

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