Grand Guignol is a French phrase that translates to "big puppet" and is often associated with theatrical productions that involve horror, violence, or gore. Some synonyms for Grand Guignol include "macabre," "gruesome," "grotesque," "terrifying," "shocking," and "bloodthirsty." These words are often used to describe art that is meant to be unsettling, disturbing, or frightening. Other similar terms include "horrorshow," "nightmarish," and "ghastly." Regardless of the word used, the idea is to convey a sense of horror or terror, often in a way that is visceral and immediate. So, these synonyms are useful for creating a sense of unease in writing or other creative works.