nozzle vs read/write head

nozzle

noun
  • The part of an earbud that accommodates eartips. 

  • The nose of an animal; muzzle. 

  • A short outlet or inlet pipe projecting from the end or side of a hollow vessel, as a steam-engine cylinder or a steam boiler. 

  • A short tube, usually tapering, forming the vent of a hose or pipe. 

read/write head

noun
  • A combination read head and write head 

How often have the words nozzle and read/write head occurred in a corpus of books? (source: Google Ngram Viewer )