Why 50,000 words? Isn't that more of a novella?

Why 50,000 words? Isn't that more of a novella?
Our experiences over the past nine years show that 50,000 is a difficult but doable goal, even for people with full-time jobs and children. The length makes it a short novel. We don't use the word "novella" because it doesn't seem to impress people the way "novel" does.