obviate vs say no

obviate

verb
  • To avoid (a future problem or difficult situation). 

  • To anticipate and prevent or bypass (something which would otherwise have been necessary or required). 

adj
  • Synonym of obviative 

noun
  • Synonym of obviative 

say no

verb
  • To reject something. 

  • To disagree; to think something or someone is doing or saying what is wrong. 

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