booster vs incentive

booster

noun
  • Something that boosts. 

  • A term that serves to amplify or strengthen an utterance, such as "really". 

  • Someone who promotes a town or business. 

  • A member of a booster club. 

  • A booster dose. 

  • A booster engine fitted to a steam locomotive. 

  • A motor-generator set used for voltage regulation in direct current electrical power circuits. 

  • A thief. 

  • A small quantity of a sensitive explosive that is triggered by a detonator and provides the energy needed to detonate a larger quantity of a less-sensitive explosive. 

  • A package of cards or figurines designed to add to a player's collection. 

  • Someone who is a fan or supporter of something. 

  • A power-up item. 

  • The first stage of a multistage rocket that provides the thrust for liftoff and the initial flight. 

verb
  • To give a booster shot to; to boost. 

incentive

noun
  • Something that motivates, rouses, or encourages. 

  • A bonus or reward, often monetary, to work harder. 

adj
  • Inciting; encouraging or moving; rousing to action; stimulating. 

  • Serving to kindle or set on fire. 

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