memorial service vs obit

memorial service

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

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

obit

noun
  • A mass or other service held for the soul of a dead person. 

  • An obituary. 

  • A record of a person's death. 

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