bemoan vs grieve

bemoan

verb
  • To moan or complain about (something). 

  • To be dismayed or worried about (someone), particularly because of their situation or what has happened to them. 

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 bemoan and grieve occurred in a corpus of books? (source: Google Ngram Viewer )