That would be a novel.
Novella
Novella
Novella
Writing a fictional prose with many characters and a complex plot of over 50000 words would require meticulous planning to keep track of character arcs and plot developments. You may want to outline the main events and character motivations to ensure coherence throughout the narrative. Remember to allow room for character growth and keep the plot moving forward steadily to engage your readers.
A narrative with more than 20,000 words but less than 50,000 words would typically fall into the novella category. Novellas are longer than short stories but shorter than novels, allowing for a more in-depth exploration of characters and plot compared to shorter narratives.
An epic
a fictional narrative of more than 20,000 words and less than 50,000 words
Narrative voice is the words and how they are put together; the narrative voice is the teller's voice.
Fifty Thousand
A novelette (or novelette) is a piece of short prose fiction.
50,000 Fifty thousand
50,000 = fifty thousand.