Sure, 'back ground narrative' and 'prelude story' are also synonyms.
Yes. 'Introductory story', 'prior narrative' and 'former account' are also synonyms for 'back story'. Think about a book where the events that happened before the main plot starts. All these words can be used to describe those events. For instance, in a detective novel, the detective's past cases and his own personal history which are relevant to the current case can be named with these synonyms.
Yes, 'root story' can also be considered as a synonym for origin story. Consider a cultural tradition, its root story would be the one that details how that tradition started, what the initial circumstances were, and how it has evolved over time. It gives a fundamental understanding of the origin of that cultural element.
Sure. 'Haunting story' is one. It gives the idea that the story will stay with you, like a haunting. 'Nightmare story' is also a synonym as horror stories can be like nightmares.
A drawn - out story. For example, a long - winded fable that goes on and on with many details and moral lessons.
Unsettled. This implies that the ending has not been made stable or final, leaving the reader with a sense of unease or anticipation. For instance, in a mystery story, if the culprit is not clearly identified and the plot is left in an 'unsettled' state, it makes the reader wonder what really happened.
Sure. 'Traditional stories', 'heritage tales' and 'legacy stories' are also synonyms for old stories.
Scare stories, hair - raising stories.