sports fan vs watcher

sports fan

noun
  • A familiar form of address, a jocular term of endearment. 

  • Used other than figuratively or idiomatically: see sports, fan. 

watcher

noun
  • Someone who observes something closely for professional reasons, such as an analyst or pundit. 

  • A guard. 

  • A kind of angel appointed to watch over the human realm, in particular one of those who became fallen angels and begot the Nephilim. 

  • Someone who keeps vigil. 

  • A political representative aligned with a candidate sent to observe elections to report on irregularities. A scrutineer. 

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