no definitive answer
While I'm not an intellecual property or internet law specialist/expert, we deal with the same issues a lot in our litigation practice. There's probably no clear answer to your question - when we apply for a federal trademark on behalf of a client, we can't know for sure or guarantee it will be approved ahead of time - that call will be made by a lawyer for the government. Similarly, using a domain name with part "Disney" is not a clear-cut situation, but I can tell you that the Disney lawyers are likely to carefully guard against anything that could create consumer confusion or dilute the value of their marks. Those are the key issues - consumer confusion and dilution of the value of the marks. I can't give you a real 'legal opinion' without our office being retained (insurance and malpractice issues - we have them, just like doctors - of course, we're partially to blame for that) but I could give you an impression if you want to send it to me privately. Please know that no matter how innocent or well intentioned you are, that does not mean that a lawyer will not try to stop you from doing it - and it can end up being an expensive battle, usually on 'their' turf, and they have a lot of in-house resources.