keening vs plaint

keening

noun
  • An unpleasant wailing sound. 

  • Intense mournful wailing after a death, often at a funeral or wake 

adj
  • Sharp, shrill, especially of a sound. 

plaint

noun
  • A complaint. 

  • An accusation. 

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