assent vs disaccord

assent

verb
  • To agree to a proposal. 

noun
  • agreement; act of agreeing 

disaccord

noun
  • The absence or reverse of accord. 

  • Disharmony. 

verb
  • To fail to be in accord; to dissent. 

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