duffer vs never-wozzer

duffer

noun
  • An incompetent, indolent, or clumsy person. 

  • Any of various nymphalid butterflies of the genus Discophora. 

  • A player having little skill, especially a golfer who duffs. 

  • A racing pigeon that does not perform well. 

  • A cow that does not produce milk. 

never-wozzer

noun
  • Someone who has never achieved anything (in a particular field); one who has had an unsuccessful career 

How often have the words duffer and never-wozzer occurred in a corpus of books? (source: Google Ngram Viewer )