ache vs grieve

ache

verb
  • To cause someone or something to suffer pain. 

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

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

grieve

verb
  • To cause sorrow or distress to. 

  • To submit or file a grievance (about). 

  • To feel very sad about; to mourn; to sorrow for. 

  • To experience grief. 

noun
  • A manager or steward, e.g. of a farm. 

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