I want to build a site that has a lot of keywords. All the keywords will contain one and the same specific word that is the theme of the site, for example "headache". Will this be over optimization if my domain name also contains this keyword? For example: "headachehub.com". All the URLs will then have the word "headache" double as it will be in the domain name and in every specific URL like this: "headachehub.com/why-do-I-have-headache.html" and "headachehub.com/my-headache-is-killing-me.html" Is this OK or should I avoid it? Thanks!