commiserate vs feel sorry for

commiserate

verb
  • To sympathize; condole. 

  • To offer condolences jointly with; express sympathy with. 

  • To feel or express compassion or sympathy for (someone or something). 

feel sorry for

verb
  • To pity; to show pity for. 

How often have the words commiserate and feel sorry for occurred in a corpus of books? (source: Google Ngram Viewer )