fault vs soundness

fault

noun
  • A characteristic, positive or negative or both, which subjects a person or thing to increased risk of danger. 

  • In coal seams, coal rendered worthless by impurities in the seam. 

  • A mistake or error. 

  • An illegal serve. 

  • A lost scent; act of losing the scent. 

  • Blame; the responsibility for a mistake. 

  • A fracture in a rock formation causing a discontinuity. 

  • A weakness of character; a failing. 

  • A minor offense. 

  • A defect; something that detracts from perfection. 

  • An abnormal connection in a circuit. 

verb
  • To commit a mistake or error. 

  • To fracture. 

  • To undergo a page fault. 

  • To criticize, blame or find fault with something or someone. 

soundness

noun
  • The result or product of being sound. 

  • The property (of an argument) of not only being valid, but also of having true premises. 

  • The property of a logical theory that whenever a wff is a theorem then it must also be valid. Symbolically, letting T represent a theory within logic L, this can be represented as the property that whenever T⊢𝜙 is true, then T vDash 𝜙 must also be true, for any wff φ of logic L. 

  • The state or quality of being sound. 

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