minus vs pitfall

minus

noun
  • A downside or disadvantage. 

  • The minus sign (−). 

  • A negative quantity. 

adj
  • Being a negative quantity; pertaining to a deficit or reduction. 

  • That is below zero by (a specified amount) on a scale. 

  • Ranking just below (a designated rating). 

prep
  • Made less or reduced by (followed by an expression of number or quantity). 

  • Without; deprived of. 

verb
  • To subtract. 

pitfall

noun
  • An antipattern. 

  • A potential, unsuspected, hidden problem, hazard, or danger that is easily encountered but not immediately obvious. 

  • A type of trap consisting of a concealed pit in the ground, which the victim is supposed to fall into and not be able to get out from. 

  • Subsidence below ground in a mine, which can cause the ground level above to drop. 

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