allay vs quell

allay

verb
  • To alleviate; to abate; to mitigate. 

  • To make quiet or put at rest; to pacify or appease; to quell; to calm. 

noun
  • Alleviation; abatement; check. 

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. 

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