Pemphigus is a rare autoimmune disease that causes blistering of the skin and mucous membranes. It is important to note that there are no real synonyms for the word pemphigus, as it is a uniquely medical term. However, some possible words that may be used to describe the symptoms of pemphigus include blistering, erosions, ulcers, vesiculation, and bullae. These terms may be used interchangeably with pemphigus, though none of them specifically or fully capture the clinical picture of the disease. Overall, the word pemphigus should be used to accurately describe the specific condition it refers to.