Reddit reviews Oxford American Dictionary Vocabulary Builder (Diccionario Oxford Monolingue Americano)
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All of the big Advanced Learner dictionaries will work for that: Merriam-Webster's, Collins COBUILD, Cambridge, Oxford - American and so on.
However... studying vocabulary from a dictionary is not optimal. I like vocabulary builders for that a lot more: Merriam-Websters and Oxford American are the the two I had used - plus TOEFL, CPE and IELTS vocabulary books. And Swan's Practical English Usage - that last section is a gold mine - highlighting the small differences between words and expressions and whatsnot). And I had found Oxford Collocations Dictionary very useful as well.
And do not underestimate the online resources - all of the big dictionaries are also online and you can look up examples and explanations very easy.