purpose vs will

purpose

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

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

noun
  • meaning for existing or doing something. 

  • Resolution; determination. 

  • Function, role. 

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

will

verb
  • To choose or agree to (do something); used to express intention but without any temporal connotations (+ bare infinitive), often in questions and negation. 

  • To instruct (that something be done) in one's will. 

  • Used to express the future tense, sometimes with some implication of volition when used in the first person. Compare shall. 

  • To bequeath (something) to someone in one's will (legal document). 

  • Expressing a present tense with some conditional or subjective weakening: "will turn out to", "must by inference". 

  • To exert one's force of will (intention) in order to compel, or attempt to compel, something to happen or someone to do something. 

  • To be able to, to have the capacity to. 

  • To habitually do (a given action). 

  • To wish, desire (something). 

noun
  • One's intention or decision; someone's orders or commands. 

  • Firmity of purpose, fixity of intent 

  • The act of choosing to do something; a person’s conscious intent or volition. 

  • One's independent faculty of choice; the ability to be able to exercise one's choice or intention. 

  • A formal declaration of one's intent concerning the disposal of one's property and holdings after death; the legal document stating such wishes. 

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