tussock vs wisp

tussock

noun
  • A tuft or clump of green grass or similar verdure, forming a small hillock. 

wisp

noun
  • A small bundle, as of straw or other like substance; any slender, flexible structure or group. 

  • A disease affecting the feet of cattle. 

  • An immeasurable, indefinable essence of life; soul. 

  • A flock of snipe. 

  • A whisk, or small broom. 

  • A will o' the wisp, or ignis fatuus. 

verb
  • To produce a wisp, as of smoke. 

  • To brush or dress, as with a wisp. 

  • To emit in wisps. 

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