deceit vs fallacy

deceit

noun
  • The state of being deceitful or deceptive. 

  • An act or practice intended to deceive; a trick. 

  • An act of deceiving someone. 

  • The tort or fraudulent representation of a material fact made with knowledge of its falsity, or recklessly, or without reasonable grounds for believing its truth and with intent to induce reliance on it; the plaintiff justifiably relies on the deception, to his injury. 

fallacy

noun
  • Deceptive or false appearance; that which misleads the eye or the mind. 

  • An argument, or apparent argument, which professes to be decisive of the matter at issue, while in reality it is not; a specious argument. 

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