allay vs dampen

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. 

dampen

verb
  • To become damped or deadened. 

  • To lessen; to dull; to make less intense (said of emotions and non-physical things). 

  • To become damp or moist. 

  • To make damp or moist; to make moderately wet. 

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