In physics|lang=en terms the difference between magnetoplasma and magnetoplasmon
is that magnetoplasma is (physics) a plasma associated with a magnetic field while magnetoplasmon is (physics) a quantum of a magnetoplasma.
As nouns the difference between magnetoplasma and magnetoplasmon
is that magnetoplasma is (physics) a plasma associated with a magnetic field while magnetoplasmon is (physics) a quantum of a magnetoplasma.