egret vs topknot

egret

noun
  • A plume or tuft of feathers worn as a part of a headdress, or anything imitating such an ornament. 

  • Any of various wading birds of the genera Egretta or Ardea that includes herons, many of which are white or buff, and several of which develop fine plumes during the breeding season. 

  • The flying feathery or hairy crown of seeds or achenes, such as the down of the thistle. 

topknot

noun
  • A decorative headdress. 

  • The New Zealand topknot, Notoclinus fenestratus 

  • A small European flounder (Phrynorhombus regius, syn. Rhombus punctatus). 

  • The brown topknot, Notoclinus compressus 

  • A decorative knot of hair on the crown of the head, sometimes having ribbons or feathers. 

  • Several species in the genus Zeugopterus 

  • A crest or knot of feathers upon the head or top, as of a bird. 

  • The Norwegian topknot, Phrynorhombus norvegicus 

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