Im building a website and have already 6 categories and 6 articles. Im going to have maybe 8 categories and lots of articles. Problem is that main keyword doesnt have synonyms. Therefore my main keyword appears in the website's name and in all of the categories. Often it can be also found in the articles titles. Is this too much of main keyword spamming? Should i change the categories so that "best x's" and "fun x's" would be "best" and "fun"?