HORSE vs trull

HORSE

noun
  • A poker variant consisting of five different poker variants, with the rules changing from one variant to the next after every hand. 

trull

noun
  • A set of three special trump cards used in some Tarock games, having a higher value than the other trumps. 

  • A female prostitute or harlot. 

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