inhumation vs obsequy

inhumation

noun
  • The act of burial. 

  • arenation 

  • The act of burying vessels in warm earth in order to expose their contents to a steady moderate heat; the state of being thus exposed. 

obsequy

noun
  • A funeral rite or service. 

  • The last office for the dead. 

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