propose vs purpose

propose

verb
  • To intend. 

  • To ask for a person's hand in marriage. 

  • To suggest a plan, course of action, etc. 

purpose

verb
  • To have or set as one's purpose or aim; resolve to accomplish; intend; plan. 

  • To have (an) intention, purpose, or design; to intend; to mean. 

noun
  • meaning for existing or doing something. 

  • Resolution; determination. 

  • Function, role. 

  • The end for which something is done, is made or exists. 

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