headstock vs nob

headstock

noun
  • A headframe. 

  • A beam that supports a bell. 

  • A part of a machine (such as a lathe or drill) that supports a rotating part 

  • A clamp that restrains a cow by the neck. 

  • The part of a lute-type string instrument, such as a guitar, that holds the tuning pegs or tensioning screws of the strings. 

  • A transverse structural member at the extreme end of a rail vehicle's underframe, also used on some bogies. 

nob

noun
  • The head. 

  • A wealthy or influential person; a toff. 

  • The glans penis, the sensitive bulbous structure at the end of the penis also known as the head of the penis. (Also spelled knob.) 

  • A jack of the same suit as the card turned up by the dealer. (See also nibs.) 

  • (vulgar, slang, chiefly UK) The penis; dick. (Also spelled knob.) 

  • A contemptible person; dick. (Also spelled knob.) 

verb
  • To hit in the head 

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