allay vs quelch

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. 

quelch

verb
  • To squelch; to eliminate. 

  • To make a squelching sound. 

noun
  • A blow; a bang. 

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