Windows has MS Word. What does Mac have as a word processor?
Unless I’m missing something, Microsoft Word is also available for macOS. For more information, visit Welcome to the new Office for Mac!.

If you’re looking for Apple's main word processor then Pages has most of the commonly used features of MS Word. It's free from the Mac App Store. For more information on Pages generally, visit Create and collaborate on documents that are beautiful beyond words.

A couple of other options are OpenOffice and LibreOffice (both free). There's also NeoOffice (which does have a small cost but offers a number of improvements over OpenOffice and LibreOffice).

As an aside, if you’re interested in a bit of history, Microsoft Word was originally available for the Mac before it was available for Windows. More specifically, it was available for Mac in 1985, four years prior to the release of the Windows version in 1989.

If your boss or professor (or other person grading your work) uses Word, then using Word yourself can help avoid grief from possible compatibility issues that can arise when other apps export to Word format.