Because they aren’t the same thing. Depending on the context, those words expressing size can mean different relative sizes depending on the word. They are intensifiers of a basic meaning.
For a similar reason, we have meaningless intensifiers like “very” and “damn”, which according to Mark Twain are interchangeable and your writing is improved if either one are removed. So “very big” is bigger than merely “big”, and “damn huge” is bigger still.
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