gruel vs prison

gruel

verb
  • to punish 

  • ejaculate 

  • To exhaust, use up, disable 

noun
  • A thin, watery porridge, formerly eaten primarily by the poor and the ill. 

  • punishment 

  • something that lacks substance 

  • semen 

prison

verb
  • To imprison. 

noun
  • Confinement in prison. 

  • A place or institution where people are held against their will, especially for long-term confinement of those awaiting trial or convicted of serious crimes or otherwise considered undesirable by the government. 

  • Any restrictive environment, such as a harsh academy or home. 

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