reducer vs reduction

reducer

noun
  • A reducing agent. 

  • A liquid used in the process of developing a negative to reduce its darkness. 

  • A function that takes state and action as arguments and returns the next state of the app. 

  • A hydraulic device for reducing pressure and hence increasing movement, used to transmit the load from the hydraulic support of the lower shackle to the lever weighing apparatus in some kinds of heavy testing machine. 

  • A component used to connect two pipes of different bores. 

  • Something that reduces. 

reduction

noun
  • The act, process, or result of reducing. 

  • a transformation of one problem into another problem, such as mapping reduction or polynomial reduction. 

  • An arrangement for a far smaller number of parties, e.g. a keyboard solo based on a full opera. 

  • A reduced price of something by a fraction or decimal. 

  • The amount or rate by which something is reduced, e.g. in price. 

  • A reaction in which electrons are gained and valence is reduced; often by the removal of oxygen or the addition of hydrogen. 

  • The rewriting of an expression into a simpler form. 

  • The process of rapidly boiling a sauce to concentrate it. 

  • A philosophical procedure intended to reveal the objects of consciousness as pure phenomena. (See phenomenological reduction.) 

  • The ratio of a material's change in thickness compared to its thickness prior to forging and/or rolling. 

  • A medical procedure to restore a fracture or dislocation to the correct alignment, usually with a closed approach but sometimes with an open approach (surgery). 

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