Which thesaurus best describes the differences between several similar words? [closed]

Which thesaurus (online or paper) best describes the differences between several similar words? As a non-native English speaker, it is often difficult for me to distinguish the slightly different concepts in similar words. I'm looking for a good online dictionary or thesaurus that compares those synonyms word by word.

I use the Oxford American Writer's Thesaurus.

But well, many online dictionaries provide synonymous terms, even if they are not specifically Thesaurus.

For example, the Oxford Advanced Learner's Dictionary sometimes provides synonyms for the terms you search. In such cases it shows the differences in meaning and, above all, in usage. But this is not always the case, unfortunately.

if you actually subscribe to Howard Gardner's Theory of Multiple Intelligences and want your synonyms and antonyms "described" to you in pictures, then check out the Visual Thesaurus. Here's an example using "articulate":

I found a good reference here. You can simply use Google by the way.