If by "wold" you mean world, and if by "world" you mean Earth, Earth is a planet.
However, an old word for world is "Cosmos" and Cosmos can mean all of creation. (The confusion is because in the old days, people reckoned that the Earth was pretty much all there was). Well, there are maybe a trillion galaxies in the Cosmos, and each one has maybe 1-100 billion stars, and if our Sun is at all representative, each star could have a few planets, so -- a lot!
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In English our world is called Earth, but it has many names in many languages.
The Transformers come from the planet Cybertron. Cybertron is a fictional planet and the home world of the Autobots and Decepticons in the Transformers universe.
No, "Planet X" is not the planet featured in the Fullmetal Alchemist series. The series is set in a fictional world where alchemy is a prominent practice, but it does not specify a particular planet as the story's setting.
Yes, the theme for World Environment Day 2011 was "Many Species. One Planet. One Future." It aimed to promote the protection of biodiversity and emphasize the interconnectedness of all living organisms on Earth in shaping a sustainable future.
The frozen planet is named Hoth, and it is a remote ice world in the Star Wars universe.