enslave vs repress

enslave

verb
  • To make subservient; to strip one of freedom; enthrall. 

repress

noun
  • A record pressed again; a repressing. 

verb
  • To check; to keep back. 

  • To press again. 

  • To forcefully prevent an upheaval from developing further. 

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