dilute vs topknot

dilute

noun
  • An animal having a lighter-coloured coat than is usual. 

adj
  • Of an animal: having a lighter-coloured coat than is usual. 

  • Having a low concentration. 

  • Weak; reduced in strength by dilution; diluted. 

verb
  • To cause the value of individual shares or the stake of a shareholder to decrease by increasing the total number of shares. 

  • To become attenuated, thin, or weak. 

  • To weaken, especially by adding a foreign substance. 

  • To make thinner by adding solvent to a solution, especially by adding water. 

topknot

noun
  • The brown topknot, Notoclinus compressus 

  • The New Zealand topknot, Notoclinus fenestratus 

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

  • A decorative headdress. 

  • 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 dilute and topknot occurred in a corpus of books? (source: Google Ngram Viewer )