I once thought that all possible ways of categorizing the world were metaphysically on a par. We may find it more useful to talk of tables and chairs, but objectively speaking this way of dividing up the world is not metaphysically privileged over alternatives that seem "gerrymandered" to us, e.g. combining chairs and cockroaches into a single category.
I now realize that my past self was very silly. Though it may at first seem puzzling that there could be privileged categories, or 'structure' to the world, it seems perfectly obvious that some pairings are objectively more similar than others. Two chairs are more alike -- have more natural properties in common -- than a chair and a cockroach, and this is nothing to do with our words and everything to do with how the world is. (A tribe might have a but a single word X that means 'chair or cockroach', but in that case their language would be objectively inferior to ours in this respect, for it fails to carve nature at the joints.)
One way to bring this out is to think about projectability, or what properties you can reason inductively from. All the emeralds I've seen so far have been green, so I expect the first emerald I see after 2020 will also be green. That seems a perfectly reasonable induction. On the other hand: "All emeralds I've seen so far have been grue, so I expect the first emerald I see after 2020 will also be grue" is clearly not good reasoning. This is because green is a more natural property than grue. It is an objectively better way to categorize reality.