给我五个英文单词，使它们在同样的上下文中使用时具有不同的含义。
1. "bank" can mean a financial institution or a sloping land mass near a body of water.
2. "watch" can mean a timepiece worn on the wrist or to observe closely.
3. "plant" can mean a living organism that produces its own food or to establish something firmly.
4. "rock" can mean a solid, naturally occurring substance or to move back and forth or from side to side.
5. "charge" can mean to demand payment or to run towards with force.