duffer vs pro

duffer

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

  • An incompetent, indolent, or clumsy person. 

  • Any of various nymphalid butterflies of the genus Discophora. 

  • A racing pigeon that does not perform well. 

  • A cow that does not produce milk. 

pro

noun
  • A professional sportsman. 

  • Professional. 

  • A prostitute. 

  • A chemical prophylaxis taken after sex to avoid contracting venereal disease. 

  • A person who supports a concept or principle. 

  • An advantage of something, especially when contrasted with its disadvantages (cons). 

prep
  • In favor of. 

adj
  • Professional. 

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