Diatribe (noun): a bitter or abusive speech of writing.

https://www.merriam-webster.com/dictionary/diatribe

Charles McGrath, A Literary Visitor Strolls in From the Airport

“Will Self’s new novel, “The Book of Dave” (Bloomsbury USA), is about a London cabdriver who inadvertantly founds a religion when a ranting diatribe he buries in the garden of his ex-wife is dug up five centuries later, in a now post-apocalyptic world, and becomes a sacred text.”

From just this sentence I was able to tell that it was some sort of written document as it would have to be to become a sacred book, however I was unaware of the actual type of book that would be a diatribe. This word makes is easier to tell the difference between a “good” book and one that is filled with hate speech.