Why is Pluto not considered a planet because it’s too small, but some planets are made entirely of gas and considered planets?

Question

Edit: I know I sound like an idiot in the replies, but I’m really asking genuine questions so thank you all for being patient and answering

In: Physics

Answer 1

Jupiter, Saturn, Uranus, and Neptune all have non-gaseous cores that are more massive than the whole of Pluto. Did you have some other planet “made entirely of gas” in mind?