Pyrogenic refers to the production or generation of heat, especially when referring to fever-causing substances or processes. There are several synonyms for this word, including febrile, thermogenic, hyperthermal, and feverish. Febrile typically refers to a condition or disease that causes fever, while thermogenic and hyperthermal both describe processes that generate heat. Feverish, on the other hand, can refer to the state of being feverish or the presence of a fever. Other related terms include pyretic, which specifically refers to substances that induce fever, and pyrogenous, which describes the production of pyrogen. Overall, these synonyms provide different ways to describe the various aspects of pyrogenic phenomena.