I agree with Pat. It’s kind of like the difference between a fiddler and a violinist. I think of myself as mostly a harper, because of the venue of music I play, and the fact I play a lever rather than pedal harp.
Having said that, however…the line can become very blurred when you have a lever harp that looks like a pedal harp and you play only classical music on it (for instance). And, it depends on the person. Some people are touchy at being designated either a “harper” or a “harpist”. I’m cool with either term, but prefer harper.
Karen