commiserate vs share another’s sorrow

commiserate

verb
  • To offer condolences jointly with; express sympathy with. 

  • To sympathize; condole. 

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

share another’s sorrow

How often have the words commiserate and share another’s sorrow occurred in a corpus of books? (source: Google Ngram Viewer )