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Cornell hosts the preprint server, but just because you find a paper there does not imply any kind of endorsement of its contents.
Yes, I'd call what you can download from the preprint server "papers," but what SwissTony is surely pointing out is that they're not peer-reviewed papers, the true "coin of the realm" in science. While a lot of what's available there does get published in peer-reviewed journals, but not everything, and you can't really put such papers on your CV as evidence of scholarly accomplishment.