hush vs tranquillity

hush

noun
  • A silence, especially after some noise 

  • A mining method using water 

verb
  • To make quiet. 

  • To appease; to allay; to soothe. 

  • To become quiet. 

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

tranquillity

noun
  • The state of being tranquil; peacefulness, the absence of disturbance or stress; serenity; calm. 

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