I'm looking at definitions here, not questions like "does this angle affect that angle?"

Is the nose angle term describing an angle relative to horizontally level, or is it relative to the trajectory the disc is traveling?

Does launch angle refer to the trajectory the disc is moving, independent of nose angle? Unlike nose angle, this describes the acceleration direction of the disc at release, right?

Do any of these metrics depend on the ground slope (I assume not but just checking)?

If a disc is thrown with a trajectory 4 degrees above horizontal and a nose angle of negative four degrees, is that disc level with respect to the ground?

I'm having trouble in particular with visualizing a disc traveling efficiently through the air at any other angle of attack than zero (that is, it's flat relative to the direction it's moving).