disallow vs say no

disallow

verb
  • To reject as invalid, untrue, or improper 

  • to overrule a colonial legislation by the sovereign-in-privy council 

  • To refuse to allow 

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 disallow and say no occurred in a corpus of books? (source: Google Ngram Viewer )