Cloud
noun
The kanji and the word are exactly the same. That means they share meanings as well.
This word uses the kun'yomi reading because it's a single kanji on its own. Luckily, that's the reading you learned with the kanji already, so you should be able to read this.
雲は、白くてコットンみたいですよね。
Clouds are white and they're like cotton.
今日は、雲のせいで日光がありませんでした。
Today, there was no sunlight because of the clouds.
夏の青空には、雲一つありませんでした。
There was not a cloud in the blue summer sky.