knob vs prominence

knob

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

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

  • The head of the penis; the glans. 

  • 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. 

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

verb
  • To have sex with. 

prominence

noun
  • A bulge: something that bulges out or is protuberant or projects from a form. 

  • The state of being prominent: widely known or eminent. 

  • Autonomous height; relative height or prime factor; a concept used in the categorization of hills and mountains. 

  • A gaseous projection, often loop-shaped, springing from the surface of the Sun or a star. 

  • Relative importance. 

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