hope vs promise

hope

verb
  • To want something to happen, with a sense of expectation that it might. 

  • To wish. 

  • To place confidence; to trust with confident expectation of good; usually followed by in. 

  • To be optimistic; be full of hope; have hopes. 

noun
  • A sloping plain between mountain ridges. 

  • A small bay; an inlet; a haven. 

  • A hollow; a valley, especially the upper end of a narrow mountain valley when it is nearly encircled by smooth, green slopes; a combe. 

  • The virtuous desire for future good. 

  • The feeling of trust, confidence, belief or expectation that something wished for can or will happen. 

  • The actual thing wished for. 

  • A person or thing that is a source of hope. 

promise

verb
  • To give grounds for expectation, especially of something good. 

  • To commit to (some action or outcome), or to assure (a person) of such commitment; to make an oath or vow. 

noun
  • A transaction between two persons whereby the first person undertakes in the future to render some service or gift to the second person or devotes something valuable now and here to his use. 

  • A placeholder object representing the eventual result of an asynchronous operation. 

  • Reason to expect improvement or success; potential. 

  • an oath or affirmation; a vow 

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