search volumes

Hey Guys, Does anyone know if there is a way to check global searches without a seed keyword? If you want to know what the most searched terms are is there a way or do all the tools need a seed keyword? Thanks

I was using Keyword Planner for a bit but they stopped showing graphs and now show incredibly vague ranges (1k-10k, 10k-100k). I read that they throttle data for those who don't actively spend on Adwords campaigns. Does anyone know how much you have to spend to get the graphs back? I think...