fettler vs friendship

fettler

noun
  • A friend or mate 

  • A person who maintains railway lines. 

  • Someone who fiddles or tinkers with things. 

  • An ostler; one who looks after the horses in a mine. 

  • Someone whose job is to sand and grind small imperfections from metal and ceramic castings. 

friendship

noun
  • The condition of being friends. 

  • Good will. 

  • A friendly relationship, or a relationship as friends. 

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