entombment vs obsequy

entombment

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

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

obsequy

noun
  • A funeral rite or service. 

  • The last office for the dead. 

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