What term is given to a fictional narrative more than 20000 words and less 50000 words?

There isn't a single universally agreed-upon term for a fictional narrative between 20,000 and 50,000 words. However, here are a few options that are commonly used:

* Novella: This is the most common term used for a work of fiction that falls within this word count range. However, "novella" is not strictly defined by word count and can vary in length.

* Long short story: This term is becoming more popular as a way to describe a work of fiction that is longer than a traditional short story but shorter than a novel.

* Mid-length fiction: This term is less common but can be used to describe any work of fiction that falls somewhere between a short story and a novel.

Ultimately, the best term to use will depend on the specific work of fiction and the context in which it is being discussed.