fake soprano
A person, ussually in youth musical theatre, who pretends to be a Soprano vocalist generally because they want the tune. Their vocal range is clearly not suitable to be a Soprano.
Sarah: I'm a soprano, we always get the tune, so it is good
Sam: You clearly cannot sing high enough to be a soprano, you are a fake soprano
Sam: You clearly cannot sing high enough to be a soprano, you are a fake soprano