overfill vs overstock

overfill

noun
  • An instance of overfilling. 

verb
  • To fill beyond capacity or beyond what is appropriate. 

overstock

noun
  • An excessive stock; a surplus or glut. 

verb
  • To stock to an excessive degree. 

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