assent vs disallow

assent

verb
  • To agree to a proposal. 

noun
  • agreement; act of agreeing 

disallow

verb
  • To reject as invalid, untrue, or improper 

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

  • To refuse to allow 

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