White perch

In a lake that I fish in SW Ohio, we occasionally catch drum using lead head
jigs when fishing for crappie and saugeye. I have heard others on this lake
make reference to catching white perch. First, I assume there is a
difference between these two type of fish. Second, I am not sure they know
what they are talking about. I have never caught nor seen a white perch,
but maybe they do exist in this lake. What are the main differences between
these fish from an identification standpoint? The drum I thought had a
round mouth more like a sucker which is very different from panfish. Maybe
I am the one who cannot tell the difference.

By the way, is white perch a good fish to eat?

Thanks,
Jeff