allay vs easen

allay

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

  • To alleviate; to abate; to mitigate. 

noun
  • Alleviation; abatement; check. 

easen

verb
  • To make at ease; make easy or easier; (by extension) to soothe; comfort; relieve 

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