When it comes to describing an active member, there are many different synonyms that can be used. Some common options include engaged, involved, committed, dedicated, and dependable. Other possibilities might include enthusiastic, diligent, hardworking, proactive, or influential. Depending on the context in which the term is being used, you might also consider variations like participatory, contributory, supportive, or helpful. Ultimately, the right synonym for the term "active member" will depend on the specific qualities and characteristics that you are trying to convey, as well as the tone and style of your writing.