|Word, Excel and the other Microsoft Office applications come as a "suite". |
When you purchase MS Office, you get them all, although you can choose not to install the ones you don't plan on using.
There is no such application as "word excel".
There is Microsoft Word, Microsoft Excel, Microsoft Powerpoint, etc. which, as I said earlier, are all part of the Microsoft Office suite.
If you want to reinstall Microsoft Word, you'll need the MS Office CD. Once the installation utility opens, you'll be given the option to chose which applications to install.
I hope that helps.