Questions about English dictionaries

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Where can I get a collection of “word spectrums”?

I understand that the The Oxford American Writer's Thesaurus includes "word spectrums" (see illustration below) for a number of words. Is there another source for such type of data? That is, I want ...
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Dictionary grouped by English levels and word's popularity

I am looking for dictionary where words would be grouped by English levels (Beginner, Elementary, Intermediate...) and popularity of them, or event just list of words grouped by levels. Thanks in ...