There's very little difference - they both look alike and perform very similar functions.
If you are asking what the differences are between Libre Office Writer and Microsoft Word, then the difference primarily is in the way the user interfaces looks. However, they do basically the same things and Libre Office Writer is compatible with Microsoft Word & vice versa. The added bonus to using Libre Office Writer is that it is free.
The original program to create them was Adobe Writer. Now you can use some different PDF programs such as PDF Creator. OpenOffice is an office suite that can save in PDF format, Microsoft Office can't unless Adobe Writer is installed.
Microsoft Office is better than the Office writer because of its compatibility with most of the systems.
* Microsoft word * ABI world * Open office * Zoho writer * Ajax world * Dark room * Text edit * Writer app * Jdark room * Word perfect * Iwork
Assuming you mean word-processing software : Microsoft Word, Ability Write, Word Perfect, Open Office Writer, Lotus Word-Pro, Microsoft Write.
MS Office is a suite of programs. MS Word is an individual program contained within the suite of MS Office !
Notepad is a very rudimentary one that comes with Windows. WordPad comes on recent versions of Windows, and has a little more functionality. Microsoft Word and OpenOffice Write are full featured word processors.
Microsoft Word is reserved specifically for typing documents. That's all a typewriter can do
Assuming you mean word-processing software : Microsoft Word, Ability Write, Word Perfect, Open Office Writer, Lotus Word-Pro, Microsoft Write, Microsoft Wordpad.
OpenOffice is one the most popular free Office Applications. It's based of Microsoft Office 2003 and contain, with others a word program named Writer. See link in related links. You can also download Microsoft Office 2013 via you Microsoft account if purchased. Se link in related links.
There are several, including some from Microsoft itself (Works, WordPad). Some are WordPerfect, IBM Lotus Word Pro, and Star Office Writer.
There are several different programs you can use to make a document. Examples include Microsoft Word, Microsoft Works, OpenOffice Writer, and many others.