However, you could use these options:
Informal:
* Novella: This is a short novel, sometimes considered a separate genre.
* Short story: A much shorter piece of fiction.
Figurative:
* Little story: This is a more playful way to refer to a novel.
* Tiny tale: This emphasizes the smaller size of the novel.
Other options:
* Pocket novel: This implies a small, easily transportable book.
* Short novel: This is a literal description, though not a common term.
Ultimately, the best choice depends on the context and your intended meaning.