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