mollify vs settle someone's nerves

mollify

verb
  • To ease a burden, particularly worry; make less painful; to comfort. 

  • To appease (anger), pacify, gain the good will of. 

  • To soften; to make tender 

settle someone's nerves

How often have the words mollify and settle someone's nerves occurred in a corpus of books? (source: Google Ngram Viewer )