bondage vs entombment

bondage

noun
  • The state of being enslaved or the practice of slavery. 

  • The practice of physically restraining people for sexual pleasure, such as by tying up or shackling. 

  • Applied to clothing with many buckles, zips, etc., associated with punk and goth subcultures. 

  • The state of lacking freedom; constraint. 

entombment

noun
  • The act of entombing or the state of being entombed 

  • The decommissioning of a radioactive site by encasing it in concrete 

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