razor vs razor-sharp

razor

noun
  • The sharp tusk of a wild boar. 

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

  • 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-sharp

adj
  • As sharp as a razor; extremely sharp. 

  • Very clever or quick-witted. 

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