Parathyroid hormone, also known as PTH, is an important hormone that plays a crucial role in regulating calcium levels in the body. Some synonyms for this hormone include parathormone, parathyrin, and PTHrp (PTH-related protein). Each of these terms refers to the same hormone and is used interchangeably in medical literature. Other synonyms for PTH include the calcium-regulating hormone, the parathyroid hormone-related peptide, and the parathyroid gland hormone. These terms are often used in scientific studies and research to refer to the same hormone and its effects on the body's calcium homeostasis.