Since 1. and 3. are already taken care of by @e-sushi, that only leaves 2., i.e.the tags distinguisher/distinguishing-attack. Having taken a look at the tag wikis and questions, I think the latter should be made a synonym of the former. I cannot suggest this as I lack the relevant reputation.
The tag wiki should probably be mostly taken from distinguishing-attack, since it seems more developed. (Excerpt might need to be rewritten.)