In physics|lang=en terms the difference between superpartner and superparticle
is that superpartner is (physics) any particle related to a more standard particle by supersymmetry while superparticle is (physics) any particle that is a superpartner of another.
As nouns the difference between superpartner and superparticle
is that superpartner is (physics) any particle related to a more standard particle by supersymmetry while superparticle is (physics) any particle that is a superpartner of another.