A tool is one kind of means. As a general term, 'means' will serve for any tool, I suppose.
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Masanori Takaoka a means of communicationa means for communicationa tool of communicationa tool for communicationCould you show me some examples about how to use them differently?Personally, I use "means of" and "tool for". According to Google's Ngrams, these are the collocations which are currently most used. Ngrams also reveal that "means of