assent vs concur

assent

verb
  • To agree to a proposal. 

noun
  • agreement; act of agreeing 

concur

verb
  • To agree (in action or opinion); to have a common opinion; to coincide; to correspond. 

  • To converge. 

  • To meet in the same point; to combine or conjoin; to contribute or help towards a common object or effect. 

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