allay vs hush

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. 

hush

verb
  • To appease; to allay; to soothe. 

  • To make quiet. 

  • To become quiet. 

  • To clear off soil and other materials overlying the bedrock. 

noun
  • A mining method using water 

  • A silence, especially after some noise 

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