cremation vs entombment

cremation

noun
  • A burning; especially the act or practice of cremating the dead, burning a corpse. 

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 cremation and entombment occurred in a corpus of books? (source: Google Ngram Viewer )