razor vs razor blade

razor

noun
  • A keen-edged knife of peculiar shape, used in shaving the hair from the face or other parts of the body. 

  • The sharp tusk of a wild boar. 

  • Any tool or instrument designed for shaving. 

  • A conceptual device that allows one to shave away unlikely explanations for a phenomenon. 

verb
  • To shave with a razor. 

razor blade

noun
  • A thin piece of steel with a sharp edge that can be fitted into a razor. 

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

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