A single word domain can be trademarked, depending on the context and other factors. Trademarking a single word domain requires a thorough review of the usage of the word and its related terms, as well as consideration of the potential for confusion in the marketplace. It is also important to assess the word's availability, as it may already be in use. If the word is determined to be available and eligible for trademarking, the process typically involves filing an application with the relevant government agency and awaiting the outcome of the review process. Ultimately, a single word domain can be trademarked, but the process requires careful consideration and examination of the relevant factors.