conceal vs repress

conceal

verb
  • To hide something from view or from public knowledge, to try to keep something secret. 

repress

verb
  • To check; to keep back. 

  • To press again. 

  • To forcefully prevent an upheaval from developing further. 

noun
  • A record pressed again; a repressing. 

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