Nodules are small, hard, rounded growths that may develop under the skin or on internal organs. There are several synonyms for nodules, including lumps, bumps, tumors, cysts, swellings, growths, masses, lesions, and protuberances. These terms may be used interchangeably to describe various types of nodules, depending on their size, location, and composition. For example, a cyst is a type of nodule that contains fluid, whereas a tumor is a nodule that is often associated with cancer. Lesions are another type of nodule that may be caused by infection or inflammation. Regardless of the specific term used, nodules may require medical evaluation and treatment to determine their underlying cause and prevent potential complications.