What do you mean? It seems to me you put in key words/phrases and it gives you key words/phrases back. Same as Overture, KeywordDiscovery, and WordTracker. It does give you different stats on the keywords, but otherwise seems pretty similar to me.
What I don't get is why anybody (myself included) still bothers with Overture. Until I saw this post I was wasting time trying to get Overture working ~ once again. Thought maybe I had too many tabs open on Firefox, too many apps open at once, etc. The dang thing is unreliable and engimatic. It compounds typos and plurals/singulars in the results, making the findings quite imprecise in many cases. Some days it gives results from January, some days it seems up to date. And no one seems to know what the story is with this dinasour of a keyword tool ... Is it coming back for good some day or are we witnessing its death throes?