You can flag the question, but there are actions which can be done without needing moderators to deal with them.
With 2000 rep, you can edit the tag to be the correct one. If the tag only appears on one question (which can be verified by hovering over it) then the incorrect tag will be cleared up and will no longer exist. This doesn't happen immediately, it probably needs an overnight script; or that may be weekly. But it will happen. With less than 2000 rep, you can suggest the edit.
spelling is already a synonym of orthography, and anyone who creates a question with tag spelling will find that it's changed to orthography automatically. With 2500 rep you can suggest tag synonyms. In this case, although speeling could be a synonym of orthography it's best to correct it since speeling is obviously wrong. [In fact it appears the user himself did this and then didn't like orthography.]
Tag creation is supposed to be moderated by 10k users in the "new tags" tool. (At the bottom of that page; it's 10k-only). I've corrected speeling and pharases and dealt with the new coin-a-term which is obviously a synonym of neologism along with coin.
To alter a privilege would be a network-wide change and unlikely to happen. But you could suggest it on meta.stackexchange.com. It could be worth asking about the rationale for setting the privilege threshold so low.
