funeral rite vs memorial service

funeral rite

noun
  • A custom or ceremony pertaining to the recently dead, such as a funeral, public burial, or the Greek custom of breaking clayen vessels on the grave or in front of the deceased's house. 

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. 

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