Short stories are rubbery when it comes to word count, as there is less room to maneouvre.
10,000 words or fewer is normally thought of as a short story; then there's a wide grey area and you have the novelette, or novella (both words diminutives of "novel") of 20,000-40,000 or a bit more, and then you blur into novels. But there are no hard-and-fast boundaries.
It was quite common in the sf and other magazines of the 40s and 50s to have a cover brag: "Complete full length novel"; but it was maybe 20-25,000 words.
W Somerset Maugham published "Up at the Villa" as a book in 1953, which ran to 30,000 words. He described it as a "novelette". I guess that's a professional's opinion!
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