forget it vs no

forget it

verb
  • Don't let it bother you; put it out of your mind. 

  • I don't want to continue with this conversation (usually used in frustration or anger). 

  • It doesn't matter. 

  • A conventional reply to an expression of gratitude. 

  • Absolutely not; I forbid it or it is impossible. 

no

intj
  • vehement rejection of truthfulness 

  • disgust 

  • mild disapproval 

adv
  • Used before different, before comparatives with more and less, and idiomatically before other comparatives. 

  • not 

  • Used idiomatically before certain other adjectives. 

particle
  • Used to show disagreement, negation, denial, refusal, or prohibition. 

  • Used together with an affirmative word or phrase to show agreement. 

  • Used to show agreement with a negative question. 

noun
  • a negating expression; an answer that shows disagreement, denial, refusal, or disapproval 

  • a vote not in favor, or opposing a proposition 

det
  • Not any. 

  • Hardly any. 

  • Not (a); not properly, not really; not fully. 

  • Not any possibility or allowance of (doing something). 

prep
  • not, does not, do not, etc. 

  • without 

  • like 

How often have the words forget it and no occurred in a corpus of books? (source: Google Ngram Viewer )