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It's better if you use four:

Terrestrial (Mercury, Venus, Earth, Mars, Ceres)

Gas Giant (Jupiter, Saturn)

Ice Giant (Uranus, Neptune)

Ice Dwarfs (Pluto, Makemake, Haumea, and Eris)

The differences are composition.

Terrestrial is made of rock and usually has a high iron composition usually sinking to the core.

Gas giants are made mostly of hydrogen and helium.

Ice giant is made of hydrogen, helium, plus volatile ices like methane and ammonia.

Ice Dwarfs are small planets made of materials that would melt if brought too close to the sun. Usually the mantle is ices and the core itself is rocky like a terrestrial planet.

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