no vs why

no

adv
  • Used idiomatically before certain other adjectives. 

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

  • not 

intj
  • vehement rejection of truthfulness 

  • disgust 

  • mild disapproval 

det
  • Not any. 

  • Hardly any. 

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

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

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

  • a vote not in favor, or opposing a proposition 

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. 

prep
  • not, does not, do not, etc. 

  • without 

  • like 

why

adv
  • Introducing a noun or other phrase. 

  • For which cause, reason, or purpose. 

  • The cause, reason, or purpose for which. 

  • Introducing a verb phrase (bare infinitive clause). 

  • Introducing a complete question. 

  • With a negative, used rhetorically to make a suggestion. 

intj
  • An exclamation used to express pleasant or unpleasant mild surprise, indignation, or impatience. 

noun
  • Reason. 

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