Horse
noun
The kanji and the word are exactly the same. That means they share meanings as well.
うま
Since this word is made up of a single kanji, it should use the kun'yomi reading. When learning the kanji, you didn't learn that reading, so here's a mnemonic to help you with this word: Imagine someone riding a horse. Who is that person? It's Uma (うま) Thurman, the famous actress.
あの馬に、ニンジンやリンゴをあげてもいいですか？
Can I give that horse carrots and apples?
草地には、白い馬がたくさんいます。
There are many white horses in the meadow.
馬が全力で走るのを見るのは楽しいです。
It's fun to see horses running at full power.