* 春 (chun): This is the most common and direct translation of "spring". It is used for the season, as well as for the concept of spring.
* 春季 (chun ji): This literally means "spring season" and is more formal than just "chun".
* 春天 (chun tian): This literally means "spring day" and is more poetic than the other two options.
So, depending on the situation, you can choose the appropriate word for "spring".