floccus vs tuffet

floccus

noun
  • A cloud species which consists of rounded tufts of cloud, often formed by dissipation from larger cloud species. Associated with cirrus, cirrocumulus, altocumulus, and stratocumulus genera. 

  • A flock or tuft of wool or wool-like hairs; the downy plumage of unfledged birds. 

tuffet

noun
  • A clump of grass or similar vegetation; a small grass-covered mound. 

  • An inflatable cushion serving as landing area for precision accuracy parachuting. 

  • A large cushion which may have an internal frame, used as a low seat or stool. 

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