beholder vs playgoer

beholder

noun
  • Someone who observes or beholds; an observer or spectator. 

  • A fictional monster in roleplaying games, a floating orb of flesh with a large mouth and many eyes on stalks. 

playgoer

noun
  • One who goes to plays; someone known to be a member of the audience at theatric productions. 

  • a person who goes to the theater regularly. 

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