fool vs loon

fool

noun
  • A person with poor judgment or little intelligence. 

  • A type of dessert made of puréed fruit and custard or cream. 

  • A jester; a person whose role was to entertain a sovereign and the court (or lower personages). 

  • A particular card in a tarot deck, representing a jester. 

  • Someone who derives pleasure from something specified. 

  • Buddy, dude, man. 

adj
  • Foolish. 

verb
  • To act in an idiotic manner; to act foolishly. 

  • To trick; to deceive. 

loon

noun
  • A crazy or deranged person; a lunatic. 

  • A boy, a lad. 

  • Any of various birds, of the order Gaviiformes, of North America and Europe that dive for fish and have a short tail, webbed feet and a yodeling cry. 

  • An English soldier of an expeditionary army in Ireland. 

  • A simpleton. 

  • A harlot; mistress. 

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