Oh no! The Marauder's Map has been seized!
Would it be appropriate to say "instruistino" if you wanted to emphasize that the teacher was female?
Yes, that works.
Would instructor work here?
Yes, it would. (Though I am not sure whether it is accepted yet.)
It's accepted now.
I thought the audio said at first, "the instruisto havas iphone."
Mi havas poŝtelefonon.