He discovered that his purpose in life was to become a doctor. The target for his arrow was the apple upon her head. My goal is to practice my Chinese every day. Having rolled up a piece of paper, her aim was the recycle bin. The class objective is to understand the fundamentals of physics.

Purpose is like intention, you intend or purpose to do something. Target can be an actual object, like a shooting target. Goal is something you wish to obtain or do. My goal is to learn Chinese. Aim is similar to goal. I aim to learn Chinese, or it can be used as a verb. Aim at the target. Objective is something you want to do. My objective is to learn Chinese. So, they are all really similar and will be understood the same way. I purpose I will learn Chinese. My target is to learn Chinese. My goal is to learn Chinese. My aim is to learn Chinese. My objective is to learn Chinese.