They are very similar in meaning, and they can often be used interchangeably. They all mean "to urge/persuade" but they all have more appropriate uses in certain contexts. "To seduce someone" is used especially in a deceptive way. When most people think of seduction, they think of it with regards to sex/prostitution. It has a negative connotation. "To tempt someone" also (usually) has a negative connotation. It has some uses in religious contexts, and connotes the mood of "desire." "To entice someone" has a neutral/positive connotation. This word is used when someone persuades someone else, but does so usually with a gift/incentive. Here are examples of each word being used in a sentence. It is unfortunate that so many young women are seduced into prostitution. Jack was tempted to spend the rest of his money on candy, but he needed the money to take the bus, so he chose not to. The sales representative from the multilevel marketing company enticed us with false promises of money and fame.