flesher vs slayer

flesher

noun
  • A butcher. 

  • A person who removes the flesh from the skin during the making of leather. 

  • A tool used to remove the flesh from the skin during the making of leather. 

slayer

noun
  • a killer; a murderer; someone who slays 

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