pair of shears vs pincers

pair of shears

noun
  • shears 

pincers

noun
  • A gripping tool, pivoted like a pair of scissors, but with blunt jaws. 

  • The front claws of crustaceans such as lobsters. 

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