The concepts broadMatch and narrowMatch are subtle and difficult to use until people have more experience. For this purpose they are far less satisfactory than (and totally different meaning than) broaderThan and narrowerThan.
If they are used, they need to be last on the list, not first, and they need to have more appropriate icons. (They probably also need to have links to help, because no one will grok the difference.)
Suggest the first icon in the list be '=', the next two be broaderThan/narrowerThan.
Do we want a term called 'is_a'? And would that be any different than 'subClass_of'?
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