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1. Which of these sentences is correct:


a) "I bought these sneakers from a selling website."


b) "I bought these sneakers from a seller website."



2. And which of these sentences correct:


a) "I bought these sneakers from a retailing website."

b) "I bought these sneakers from a retailer website."

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I don't hear these things said. What I hear is I bought these sneakers online.

Clive

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I agree with Clive. We also say "an online seller".

In any case, they are not compound nouns, but syntactic constructions consisting of modifier + head.