different between tardyon vs superbradyon

English

Blend of tardy +? tachyon or tardy +? -on.

tardyon (plural tardyons)

(physics) Any particle with non-zero mass (i.e. one that travels more slowly than the speed of light).
- 1972, Isaac Asimov, Asimov's Guide to Science
  One, our own, is the tardyon-universe, in which all particles go at subluminal velocities and may accelerate to nearly the speed of light.

super- +? bradyon

superbradyon (plural superbradyons)

(physics) a particle with positive mass and positive energy and a superluminal critical speed in vacuum, possibly an ultimate constituent of matter similar to preons.

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