mouton vs wether

mouton

noun
  • Sheepskin processed to resemble beaver or seal fur. 

  • A 14th-century French gold coin, weighing about 70 grains. 

wether

noun
  • A castrated goat. 

  • A castrated ram. 

verb
  • To castrate a male sheep or goat. 

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