bivalve vs muff

bivalve

noun
  • A pericarp in which the seed case opens or splits into two parts or valves. 

  • Any mollusc belonging to the taxonomic class Bivalvia, characterized by a shell consisting of two hinged sections, such as a scallop, clam, mussel or oyster. 

muff

noun
  • A short hollow cylinder surrounding an object such as a pipe. 

  • A blown cylinder of glass which is afterward flattened out to make a sheet. 

  • The feathers sticking out from both sides of the face under the beak of some birds. 

  • A fool, a stupid or poor-spirited person. 

  • A woman or girl. 

  • An error, a mistake; a failure to hold a ball when once in the hands. 

  • A piece of fur or cloth, usually with open ends, used for keeping the hands warm. 

  • Female pubic hair; female genitals (vulva, vagina), like muffin. See Thesaurus:vagina. 

  • A bird, the whitethroat. 

  • A muffin. 

verb
  • To drop or mishandle (the ball, a catch etc.); to play badly. 

  • To mishandle; to bungle. 

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