There are numerous synonyms for the term "hypodermic needle." Some of the common synonyms include injectable needle, injection needle, medical syringe, and subcutaneous needle. Other synonyms for the term include piercing needle, vaccinating needle, needle and syringe, and hollow needle. These terms all refer to a medical device that is used to deliver medication or other fluids beneath the skin's surface. The device typically consists of a thin, hollow needle with a sharp tip that can penetrate the skin with minimal pain. These synonyms are often used interchangeably in medical contexts but may have slight differences in meaning depending on the context.