quell vs quench

quell

verb
  • To suppress, to put an end to (something); to extinguish. 

  • To die. 

  • To subdue, put down, or silence (someone or something); to force (someone) to submit. 

noun
  • A subduing. 

  • An emotion or sensation which rises suddenly. 

  • A source, especially a spring. 

quench

verb
  • To extinguish or put out (as a fire or light). 

  • To satisfy, especially a literal or figurative thirst. 

  • To rapidly change the parameters of a physical system. 

  • To cool rapidly by direct contact with liquid coolant, as a blacksmith quenching hot iron. 

  • To terminate or greatly diminish (a chemical reaction) by destroying or deforming the remaining reagents. 

  • To rapidly terminate the operation of a superconducting electromagnet by causing part or all of the magnet's windings to enter the normal, resistive state. 

noun
  • The abnormal termination of operation of a superconducting magnet, occurring when part of the superconducting coil enters the normal (resistive) state. 

  • A rapid change of the parameters of a physical system. 

  • The act of quenching something; the fact of being quenched. 

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