IMO, wish (deleted) and harry-potter (deleted) do not appear to serve any useful purpose and can be deleted. Other tags which appear ripe for deletion/synonymisation:
I'm not sure about these either:
- untagged
- idiomaticity (Suggested as a synonym of idioms)
- acceptability
Edit: I've added a (deleted) note to those tags which have been deleted. Users who can should visit the suggested synonyms page and vote on any pending suggestions.