"Instructor" and "Student" do -- why bother with anything else?
Do you mean that students should address me as 'Instructor,' and that I should address them as 'Student'? In the latter case maybe there would need to be subscripts.
When it comes to email, I prefer to address them by name, to reciprocate their standard greeting: 'Hi, Bob.'
When did 'Hi' come to replace 'Dear' as the salutation of choice? It's now as ubiquitous as '[to] reference,' as in 'She references two of Whitehead's works.' There are trends and there are trends.
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