assertion vs profession

assertion

noun
  • Something which is asserted; a declaration; a statement asserted. 

  • A statement in a program asserting a condition expected to be true at a particular point, used in debugging. 

  • A statement or declaration which lacks support or evidence. 

  • The act of asserting; positive declaration or averment. 

  • Maintenance; vindication 

profession

noun
  • Any declaration of belief, faith or one's opinion, whether genuine or (as now often implied) pretended. 

  • The practitioners of such an occupation collectively. 

  • The declaration of belief in the principles of a religion; hence, one's faith or religion. 

  • A promise or vow made on entering a religious order. 

  • An occupation, trade, craft, or activity in which one has a professed expertise in a particular area; a job, especially one requiring a high level of skill or training. 

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