The Japanese term for "synonym discussion"? In English, when I want to know the subtle differences in meaning between similar words I consult a thesaurus's synonym discussion. To give an example of this, see halfway down Merriam-Webster's thesaurus page for the word "ponder". Several English thesauruses have them, but not all thesauruses do. Is there a term for this which Japanese thesauruses conventionally use?

The similar section in a Japanese thesaurus names itself **** --"usage differentiation" or "using accordingly", and I think this is a pretty stable choice of word. It however does not contain the word "synonym", which, in the case you want specify, could be added like .