What's the name of this fallacy?
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Original Question
for the sake of simplicity i will refer to things in question as x and y
Person1: X and Y are the same thing
Person 2: No, X and Y are different, if they were the same we wouldn't have to refer to them as X and Y; only X or Y (basically only one thing would exist and not the other)
Comments on Question
Answers
4Without knowing what X and Y is it would be hard to say if it is a fallacy or not. Sometimes different words have the same meaning sometimes they do not.
Person 2 is banking on the assumption that if 2 words are different from each other, they describe different concepts. This ignores the possibility that they could be synonymous terms. If they are synonyms, then the premise is false.
E.g. "furious" and "livid" are both phrases used to refer to extreme anger.
This is less to do with fallacies and more to do with incorrect information.
Ambiguous assertion. The subterfuge is intentional.
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I think the question is kind of vague. Two words, as Rationalissimus of the Elenchus stated, can mean the same thing. But I think you need to expand your question further.