haystack vs thatch

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) 

thatch

noun
  • Straw, rushes, or similar, used for making or covering the roofs of buildings, or of stacks of hay or grain. 

  • A buildup of cut grass, stolons or other material on the soil in a lawn. 

  • Any straw-like material, such as a person's hair. 

  • Any of several kinds of palm, the leaves of which are used for thatching. 

verb
  • To cover the roof with straw, reed, leaves, etc. 

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