con 和 fraud 的差別在哪裡？如果不好說明，請提供一些例句。

They can refer to the same thing. They usually refer to causing someone financial loss, but can also refer to deception in general. They can both be used as a verb or a noun. A person who perpetuates fraud is called a fraud. A person who perpetuates a con is called a con man. Both can refer to criminal activity or to just deceit that isn't a crime.
"I was thinking about investing in a cryptocurrency company, but I found out is all a fraud."
"I was thinking about investing in a cryptocurrency company, but I found out is all a con."
"The new teacher said he had a degree in mathematics, but it was a lie. The man is a fraud."
"The new teacher said he had a degree in mathematics, but it was a lie. He is a con man."
"My neighbor is trying to con me into helping him move this weekend."