aigrette vs caruncle

aigrette

noun
  • The feathery crown of some seeds (such as the dandelion). 

  • The lesser white heron. 

  • A feather or plume, or feather-shaped item, used as an adornment or ornament. 

caruncle

noun
  • A colored waxy or oily outgrowth near the micropyle of some seeds, attractive to ants which aid the seed's dispersal. 

  • A small, fleshy excrescence that is a normal part of an animal's anatomy. 

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