Well, I'm not a lawyer... but there could very well be some. Though, my question would be more what would be the point of these domains? If there is something specific you have in mind for them... ok. They are just not "natural" ... what I mean is that I don't know many people who are going to say "I'm going to WalShopMart.... be right back".... so things like SEO and searchability would be affected.