allay vs sugarcoat

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. 

sugarcoat

verb
  • To make superficially more attractive; to give a falsely pleasant appearance to. 

  • To coat with sugar. 

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