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I just downloaded and installed MS Office 2011 yesterday, and have primarily been using Word. It froze on me for a moment or two while working a document last evening, but has done well so far today. Hope it works out for you.

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Oops! I just realized after posting that I am in the Mavericks thread. I'm still using Mountain Lion. Sorry!
 
I am on beta 2 Mavericks 10.9 and I can run all of the Office 2011 apps. I just opened all of them and they are open now as I type this. I'm running Office 2011 from the Office365 Home Premium yearly package.

Maybe, remove and reinstall?
 
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