razor vs safety razor

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. 

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). 

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