accede vs assume

accede

verb
  • To come to an office, state or dignity; to attain, assume (a position). 

  • To become a party to an agreement or a treaty. 

  • To agree or assent to a proposal or a view; to give way. 

assume

verb
  • To take on a position, duty or form 

  • To receive, adopt (a person) 

  • To adopt a feigned quality or manner; to claim without right; to arrogate 

  • To authenticate by means of belief; to surmise; to suppose to be true, especially without proof 

  • To adopt (an idea or cause) 

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