haystack vs stook

haystack

noun
  • A mound, pile, or stack of stored hay. 

  • A dish composed of a starchy food (rice, tortillas, crackers, etc.) topped by a protein (beans, cheese, meat, etc.) in combination with fresh vegetables, assembled on the plate by the diner. 

  • A standing wave in a rapid. 

  • The text string within which another string is searched for. (see: needle in a haystack) 

stook

noun
  • A pile or bundle, especially of straw. 

  • A group of 6 or 8 sheaves of grain stacked to dry vertically in a rectangular arrangement at harvest time, largely obsolete since the advent of combine harvesters and powered grain driers (mid 20th century). 

verb
  • To make stooks. 

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