offering vs proposal

offering

noun
  • The act by which something is offered. 

  • Something put forth, bid, proffered or tendered, such as for sale 

  • That which has been offered; a sacrifice. 

  • A contribution given at a religious service. 

  • An oblation or presentation made as a religious act. 

proposal

noun
  • The offer by a party of what he has in view as to an intended business transaction, which, with acceptance, constitutes a contract. 

  • The terms or conditions proposed 

  • A scheme or design 

  • The document on which such a thing is written. 

  • The act of asking someone to be one's spouse; an offer of marriage 

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