razor blade vs shaver

razor blade

noun
  • A replaceable cartridge in which razor blades are set, fitted into a razor. 

  • A thin piece of steel with a sharp edge that can be fitted into a 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 razor blade and shaver occurred in a corpus of books? (source: Google Ngram Viewer )