Similar Problem and Solution
I had the same problem and error codes.
I found that there are two apparently unrelated issues.
First, a problem with track changes on. MS Word kept crashing on opening and did not allow me to do or modify anything within the program before it crashed. The issue was solved by finding the document it was reopening every time and deleting it so that MS Word wouldn't find it.
Second, MSW 2011 doesn't handle well multiple monitors or spaces. When a monitor is connected or disconnected, when several windows are open in different spaces or when full screen is turned on, and another document is open in another monitor/space, MSW will crash.
There seems to be an obvious 3rd problem related to the fact that MSW does not seem to recognize Yosemite from Maverick. A patch will likely solve that once Yosemite gets out from Beta.
Finally, in the meantime, I will only use track changes after disabling spaces, and turn them back on when I finish tracking changes.