memorial service vs obsequy

memorial service

noun
  • An informal service honoring a deceased person, especially one that does not adhere to the traditional customs of a funeral. 

  • A ceremony to honor a deceased person; a funeral. 

obsequy

noun
  • A funeral rite or service. 

  • The last office for the dead. 

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