plumage vs tussock

plumage

noun
  • Layer or collection of feathers covering a bird’s body; feathers used ornamentally; feathering. 

  • Finery or elaborate dress. 

tussock

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

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