Star
noun
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You didn't learn that reading with the kanji, so here's a mnemonic to help you:
Did you know the Aries cluster of stars used to be called the Hoe Sheep (ほし) constellation? Nah, I'm only messing, but Aries is represented by a ram and actually looks a little like a hoe. And hey, "hoe sheep" sounds like ほし. So, you know, don't let the truth get in the way of a good story.
夜には、星がとてもきれいでした。
That night the stars were really pretty.
青森には美しい星空が広がっています。
A beautiful starry sky stretches over Aomori.
フルーツをハート形や星形に切るとかわいいし、小さい子にも人気ですよ。
Fruits cut into heart and star shapes are cute, and popular with children.