Thesaurus
Contrasting senses

Before Roget, most thesauri and dictionary synonym notes included discussions of the differences among near-synonyms, as do some modern ones.

Merriam-Webster's Dictionary of Synonyms is a stand-alone modern English synonym dictionary that does discuss differences. In addition, many general English dictionaries include synonym notes.

Several modern synonym dictionaries in French are primarily devoted to discussing the precise demarcations among synonyms.
change_case:capital_word_frequency[3], language:response_language[Portuguese], detectable_content:number_placeholders[8]