plaint vs sob

plaint

noun
  • A complaint. 

  • An accusation. 

sob

noun
  • sound of sob 

  • A cry with a short, sudden expulsion of breath. 

verb
  • To soak. 

  • To say (something) while sobbing. 

  • To weep with convulsive gasps. 

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