Can you download microsoft words on iphone?

Can you

No, it is not currently possible. There's no official Microsoft Office for iPhone. If you want a similar word processing application for iPhone, I recommend Pages.

Pages for iOS may not be as sophisticated as other desktop word-processing apps, but it packs plenty of punch when you just want a way to produce nice-looking documents on the go. You will be able to create documents with stylized text, imported images, tables, and graphs, and make formatting changes on-the-fly, all using the touch-screen keyboard.

The program comes with 16 Apple-designed templates to start from, including standard letters, letters with photos, resume layouts, project reports, and many more. With Apple's keyboard dock connected, Pages performed much like a word processor on a desktop computer, with the one major difference of using the touch screen, rather than a mouse, to perform formatting and other file management actions.

On the iPhone, a newly added Smart Zoom feature lets you focus in on the job at hand, but the smaller screen real estate makes working a little cramped. Still, it's definitely convenient to be able to edit documents quickly on your phone.