How many words do a novel, a novella and a short story need?

the definitions are defined by the number of the words as far as i know. i know a short story needs 7,500 words - if i am not mistaken. what about a novella? what makes a novella different from a short story? and ultimately, what about a novel? how many words does it need to be "complete" so that the... show more the definitions are defined by the number of the words as far as i know. i know a short story needs 7,500 words - if i am not mistaken. what about a novella? what makes a novella different from a short story? and ultimately, what about a novel? how many words does it need to be "complete" so that the publishers may accept it?
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