breastplate vs knob

breastplate

noun
  • A piece of armor that covers the chest. 

  • A piece of horse tack designed to prevent the saddle slipping backwards. 

  • A piece of silicone in the shape of women's breasts worn by drag queens and other female impersonators to simulate a female body shape. 

  • An embroidered square of linen worn on the breast of the Jewish high priest, bearing twelve precious stones, each inscribed with the name of one of the tribes of Israel. 

knob

noun
  • A rounded ornament on the hilt of an edged weapon; a pommel. 

  • A ball-shaped part of a handle, lever, etc., designed to be grabbed by the hand. 

  • The head of the penis; the glans. 

  • A rounded protuberance, especially one arising from a flat surface; a fleshy lump or caruncle. 

  • A woman's breast. 

  • A contemptible person; dick. 

  • A prominent rounded hill. 

  • A freshman at The Citadel, The Military College of South Carolina. 

  • The clitoris. 

  • A rounded control switch that can be turned on its axis, designed to be operated by the fingers. 

  • A prominent, rounded bump along a mountain ridge. 

  • A dollop, an amount just larger than a spoonful (usually referring to butter). 

  • A chunky branch-like piece, especially of a ginger rhizome. 

  • A bulb of the garlic plant consisting of multiple cloves. 

verb
  • To have sex with. 

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