Which word does not belong exuberance ardor enthusiasm and exorbitance?

The Word that does not belong is "exorbitance." While "exuberance," "ardor," and "enthusiasm" all convey positive emotions related to passion or eagerness, "exorbitance" refers to an excessively high amount, often in terms of price or quantity. Thus, it has a different meaning and connotation compared to the other three Words.