flocculus vs floccus

flocculus

noun
  • A small fluffy tuft. 

  • A marking on the surface of the sun associated with a solar prominence. 

  • Either of two small lobes on the posterior border of the cerebellum. 

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. 

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