Plagiarism
There is an overlap between copyright and plagiarism in many cases, but it is possible for an action to be plagiarism without being a copyright violation and vice versa. For example, reproducing a public domain work and passing it off as your own might be plagiarism, but there would be no copyright infringement. A work might be properly attributed, and so there might be no plagiarism, but that reproduction still might be a copyright violation.