headstock vs peghead

headstock

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

  • A beam that supports a bell. 

  • A headframe. 

  • 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. 

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

peghead

noun
  • The part of a stringed instrument, at the end of the neck, that holds the pegs or mechanical tuners used to control string tension. 

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