bounty vs contribution

bounty

noun
  • A monetary reward for capturing (or, in the past, killing) a person accused or convicted of a crime and who is at large; also, a similar reward for capturing or killing an animal which is dangerous or causing a nuisance. 

  • Generosity; also (countable) an act of generosity. 

  • A reward for some specific act, especially one given by an authority or a government. 

  • An abundance or wealth. 

  • Money paid to a person when becoming a member of the armed forces, or as a reward for some service therein. 

  • Something given liberally; a gift. 

verb
  • To offer a monetary reward for the capturing or killing of. 

contribution

noun
  • An amount of money given toward something. 

  • Something given or offered that adds to a larger whole. 

  • The act of contributing. 

  • The taking part, often with the idea that it has led to (scientific etc.) progress. 

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