effectivity vs might

effectivity

noun
  • The ability or power to be effective. 

  • [Technical documentation] An indication of the product, procedure, or timescale for which an item of information is applicable or effective. 

  • A measure of the effectiveness of something. 

might

noun
  • The ability to do something. 

  • Power, strength, force or influence held by a person or group. 

  • Physical strength or force. 

verb
  • simple past tense of may Used to indicate permission in past tense. 

  • Used to indicate conditional or possible actions. 

  • Even though. 

  • Used in polite requests for permission 

  • Used to indicate a desired past action that was not done. 

  • simple past tense of may Used to indicate possibility in past tense. 

  • Used to express certainty. 

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