There is no definitive answer to this question as it depends on factors such as the nature of your blog, the content on your blog, and the specific copyright laws in your country. However, generally speaking, you cannot copyright a word or phrase on a blog. Instead, copyright protection for a blog is typically based on the originality of the content and the extent to which you have modified that content.
In some cases, if you have created an entire website based on your blog content, then you may be able to protect that website as a whole with copyright protection. However, this is not always the case, so it is important to consult with an intellectual property lawyer if you are uncertain about your legal rights.
In conclusion, it is generally not possible to copyright a word or phrase on a blog. However, if your blog contains original content that is protected by copyright law, then you may be able to protect that content through various legal avenues.
Consult with an intellectual property lawyer if you are unsure about your legal rights.