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.
Sure, 'back ground narrative' and 'prelude story' are also synonyms.
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.
Yes, there are also 'celebrated novel', 'esteemed fictional work' and 'memorable story'. A 'celebrated novel' is one that is widely known and praised. 'Esteemed fictional work' indicates that it is held in high regard in the literary community. And a 'memorable story' is something that readers can't easily forget, which is often true for classic novels as they usually have very engaging plots and characters.