The Islamic Army of Aden refers to a militant group operating in Yemen. Synonyms for the term could include the Aden-Abyan Islamic Army, which is a previous name the group has used. Other potential synonyms could include the Aden-Abyan Islamic Movement or the Yemeni Jihadist Movement. However, it's important to note that using different names or synonyms for this group can be confusing and may pose challenges when it comes to tracking and monitoring their activities. It's essential to stay up-to-date on accurate information and terminology when discussing militant groups operating in the Middle East and around the world.