safety razor vs shaver

safety razor

noun
  • A razor, designed for safety, that protects the skin from all but the very edge of the blade (as opposed to a straight razor). 

shaver

noun
  • A tool or machine for shaving; an electric razor. 

  • A boy; a lad; a little fellow. 

  • One who shaves. 

  • A barber, one whose occupation is to shave. 

  • One who fleeces; a pillager; a plunderer. 

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