Do u know a reseach tool like woodtracker but instead find term- synonym,brand

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as title... i've been thinking since keyword is so tough to compete, wouldn't it be better if we were to use keyword associated to term rather than main keyword, example if im using keyword "shoes" , i like to use a tool that enable me to find brand of shoes , popular type of material on shoes , stuff people hate about shoes... etc, more or less like tag cloud in forum do u guys have any idea what tool i should use? or maybe a way to manipulate google keyword tool...