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@freemo Okay, that's where I take issue. The unmodified term "planet" has a very strong connotation, both in scientific and common use, of referring only to major planets, not to the larger category (to the point where Wikipedia doesn't even have a separate article on "major planet"; it just redirects you to "planet"... it does, however, have a separate article on "dwarf planets")

Personally, I think we should classify them only by size:
1) Asteroid - not rounded
2) Barren Planet- round, but not massive enough to hold atmo (pluto, mercury, the moon)
3) Terrestrial planet- has atmo, but clear surface division between gas & liquid if any (venus, earth, mars, titan)
4) Gas giant planet- massive enough that atmo smoothly transitions from gas-to-liquid with altitude
5) Dwarf stars
6) Mainline stars
7) Giant stars,
8) Neutron stars,
9) Black holes