allay vs subdue

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. 

subdue

verb
  • To overcome, quieten, or bring under control. 

  • To bring (a country) under control by force. 

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