I think there are a couple more synonymous tags that need dealing with? We currently have synth and synthesizer which I see as being the same? There is then tags for synthesis and granular-synthesis which I think could be combined?
I think synth and synthesizer are certainly referring to the same thing, and I've proposed a synonym. owever, I'm not sure if synthesis (meaning making sounds via synthesis) and synthesizer (the instrument) are necessarily appropriate on the same questions, so I haven't touched those.
I definitely think that the different categories of synthesis (additive, subtractive, granular, frequency modulation, etc) do not need their own tags, and will work just fine within one catch-all synthesis tag. Currently there are just over 100 questions with a tag contaning the string
synth so I don't think being any more specific with such tags is going to help much.