quell vs tamp down

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. 

tamp down

verb
  • To suppress (something, usually an emotion or thought). 

  • To compact a substance (usually soil) until it is flat. 

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