"Membership fee" is a common term used to describe the cost associated with joining an organization. However, there are many different ways to refer to this fee depending on the context and type of organization. Some synonyms include dues, subscription, enrollment fee, entrance fee, initiation fee, and registration fee. Dues and subscription are often used for recurring fees paid annually or monthly, while enrollment fee and registration fee are associated with a one-time payment for joining or attending an event. Entrance fee and initiation fee are used for exclusive organizations where a prospective member needs to pay a fee to become a member. Overall, these synonyms provide flexibility in describing the cost of joining an organization.