Well, that's typically referred to as the 'central theme'. It's the main concept or idea that gives the story coherence and depth. It can be something like love, courage, or justice that is explored and developed throughout the narrative.
Once upon a time, there was a small 'tiny' creature. It lived in a 'little' hole. One day, it went on a 'journey' which was actually just a'strip' through the forest. It was looking for 'food' or'sustenance'.
A synonym novel could potentially be a work of fiction that focuses on the exploration of language through synonyms. In such a novel, the author may use synonyms not just for the sake of variety but also to convey different shades of meaning. For instance, instead of always using the word 'happy', the author might use 'joyful', 'content', 'elated' etc. at different points in the story. This can create a more nuanced and vivid portrayal of the characters' emotions and the overall atmosphere of the novel. It can also engage the reader on a different level as they subconsciously notice the different word choices and the subtle differences in meaning.
A synonym story could be like this. Let's take the word 'big'. One day, a little boy was looking at a huge elephant at the zoo. Instead of using 'big', he could say 'large' or 'enormous' to describe the elephant. It was an amazing sight, and the synonyms added more color to his description.
Fiction isn't always a synonym for literary. Literary works usually have more depth, complex language, and cultural significance. Fiction can be more broad and may not meet these standards.