decider vs definitive

decider

noun
  • A person, divinity, or authoritative text which decides. 

  • A Turing machine that halts regardless of its input. 

  • An event or action which decides the outcome of a contested matter. 

definitive

noun
  • a word, such as a definite article or demonstrative pronoun, that defines or limits something 

  • an ordinary postage stamp that is part of a series of all denominations or is reprinted as needed to meet demand 

adj
  • conclusive or decisive 

  • general, not issued for commemorative purposes 

  • explicitly defined 

  • definite, authoritative and complete 

  • limiting; determining 

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