Hand
Arm
noun
The kanji means hand, and the word means hand too! It can also be used to refer to your whole arm.
Since this word is made up of a single kanji, it uses the kun'yomi reading. Since this is a body part, the kun'yomi reading usually takes priority. That means you learned the kun'yomi reading already when you learned the kanji.
王は手を上げて「おはよう！」といった。
The king raised his hand and said, "Good morning!"
手をつないでもいい？
Can I hold your hand?
パパの手はモジャモジャだ。
Dad's arms are all shaggy.