A document created in Pages must be translated during export into MS Word .doc format. As Pages is not an MS Word clone, it may allow you to create document content that upon export, is partially or wholly incompatible with Microsoft Word.
Rather than wait for this potential, unpleasant surprise, you should consider using MS Word from Office for Mac 2011. The faculty may be using MS Office on Windows, or the Mac version. Paper submissions usually are time consuming and important for the course grade. Why gamble?