1. hurt伤害（感情）。普通用词，没有injure正式，常用于口语。多用于有生命的东西,常指肉体上的伤害，也可以指精神上的痛苦或感情上的伤害。作不及物动词，表“疼痛”。 

Luckily no one was seriously hurt in the car accident. 

The girl fell off her bike, and one of her legs hurt.

2. injure伤害，损害（感情），损害（名誉）。普通用词，常指各种性质的身体上或精神上的伤害。多指事故中人或物的损伤，包括容貌、生理、身体等。 

In the traffic accident, two were killed and three get injured.

在交通事故中，两人遇难，三人受伤。 

He was so injured in his pride that he stayed at home all day without meeting anyone.

他的自尊受到了如此的伤害以至于他成天待在家里，不见外人。

3. wound使受伤，伤害，损害，主要指外界暴力或用武器造成身体上较重的伤害，像刀伤、枪伤、刺伤等。多指战场上受伤，还可以指精神上的创伤。 

The soldier was badly wounded in the head.这个士兵头部受了重伤。 

The bullet wounded his arm.子弹打伤了他的胳膊。

4. harm一般指伤害有生命的东西，常指伤及人的健康、权利、事业等。 

There was a fire in our street, but no one was harmed. 

Getting up early won”t harm you! 早起对你没有害处。