effect vs validity

effect

noun
  • The state of being binding and enforceable, as in a rule, policy, or law. 

  • The result or outcome of a cause. 

  • An illusion produced by technical means (as in "special effect") 

  • Belongings, usually as personal effects. 

  • Consequence intended; purpose; meaning; general intent; with to. 

  • A scientific phenomenon, usually named after its discoverer. 

  • Execution; performance; realization; operation. 

  • An alteration, or device for producing an alteration, in sound after it has been produced by an instrument. 

  • Impression left on the mind; sensation produced. 

verb
  • To make or bring about; to implement. 

validity

noun
  • State of having legal force. 

  • The genuinity - as distinguished from the efficacity or the regularity - of a sacrament as a result of some formal dispositions being fulfilled. 

  • The state of being valid, authentic or genuine. 

  • A quality of a measurement indicating the degree to which the measure reflects the underlying construct, that is, whether it measures what it purports to measure (see reliability). 

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