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 don't think synthesis and granular synthesis should be combined. Granular synthesis is a form of synthesis. Regarding synthesizer vs synth I agree, remove synth would be my the best option in my opinion.
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.
I think car/cars and vehicle/vehicles can be combined: even though one is a subset of the other, the majority of the questions and answers will apply to the broader category and will be of interest to people looking for information about cars or any other corner of the category.