ache vs commiserate

ache

verb
  • To suffer pain; to be the source of, or be in, pain, especially continued dull pain; to be distressed. 

  • To cause someone or something to suffer pain. 

noun
  • Continued dull pain, as distinguished from sudden twinges, or spasmodic pain. 

commiserate

verb
  • To sympathize; condole. 

  • To offer condolences jointly with; express sympathy with. 

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

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