floccus vs pappus

floccus

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

  • 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. 

pappus

noun
  • The first hair on the chin. 

  • The markedly reduced sepals of an Asteraceae floret that take the form of trichomes or scale attached to the ovary or seed. 

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