penal vs rehabilitative

penal

adj
  • Serving as a place of punishment. 

  • Exorbitant. 

  • Of or relating to punishment. 

  • Subject to punishment; punishable. 

rehabilitative

adj
  • Tending to rehabilitate. 

  • For the purpose of rehabilitation. 

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