A-lister is a term used to describe a celebrity who has achieved the highest level of fame and popularity. However, there are several synonyms that can be used to describe these top-tier individuals. One such synonym is superstar, which refers to a highly successful and well-known person in a particular field, especially entertainment. Another synonym is megastar, which is used to describe someone who has reached the pinnacle of success and has a massive fan following. Icon and legend are also used to describe someone who has made a significant impact in their industry and is revered by fans and peers alike. Lastly, VIP or high-profile individual can be used to describe someone who is famous and influential.