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Yes, you can. There are many office applications like WPS Office + PDF, Office suite etc for Kindle fire and it support Word, Excel and Power Point files. It is for less than $10
When you get the Kindle, you will see an application named Amazon App Store on it. Open it and just search Office. From the list of application, download the office apps.
If you have any questions or would like any additional information, please don't hesitate to ask.