Chills and fever is a term used to describe a group of illnesses that cause a person to experience alternating episodes of fever and chills. MALARIA, an infectious disease caused by a parasite, is one of the most common causes of chills and fever. AGUE, another name for MALARIA, is also a four-letter word for chills and fever. FLU, or influenza, is a viral infection that can also cause chills and fever. Agues is a five-letter word for chills and fever, and is an archaic term for MALARIA.