floccus vs pinna

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. 

pinna

noun
  • A feather, wing, fin, or other similar appendage. 

  • The visible part of the ear that resides outside of the head, the auricle; outer ear excluding the ear canal. 

  • A leaflet or primary segment of a pinnate compound leaf. 

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