loon vs poon

loon

noun
  • A harlot; mistress. 

  • 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. 

poon

noun
  • A wimp; a pussy. 

  • Any of several East Indian trees of the genus Calophyllum, yielding a light, hard wood used for masts, spars, etc. 

  • Poontang, the vagina, or, intercourse with a woman. 

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