Well, in a story, another name for the enemy can be 'the foe'. It's a simple and straightforward term that clearly indicates the opposing force. Also, 'the adversary' is often used. This word has a bit more of a formal or literary feel to it. For example, in a classic adventure story, the hero might face an adversary who is trying to steal a precious artifact. The term 'antagonist' is very common too. It refers to the character or force that opposes the protagonist and creates conflict in the story.
The antagonist.
A yarn can also be another name for a story. This term is often used in a more informal or folksy way. People might say 'spin a yarn' which means to tell a story, usually one that is interesting or perhaps a little exaggerated.
A chronicle. A chronicle is more like a record of events in the order in which they occurred. However, it can also be seen as a type of story, especially when it is told in a more engaging and narrative way, like historical chronicles that describe the lives of people and the events of a particular time period.
A short story can also be called a novelette or a short narrative.
Another name for plot in a story could be'storyline'.
Another name for an apocraphal story could be a unauthenticated story. Apocraphal stories are often not part of the official or recognized canon. They might be legends or rumors that have been passed around without solid evidence to support their truthfulness. So, unauthenticated story is a fitting alternative name.