Nonsteroidal anti-inflammatory (NSAID) is a term used to describe drugs that reduce pain, inflammation, and fever in the body. There are several synonyms that can be used to describe these drugs, including analgesic, anti-inflammatory drug, pain reliever, and anti-fever drug. These drugs are often used to treat conditions like arthritis, menstrual cramps, and migraines, and they work by inhibiting the production of prostaglandins, which are chemicals that cause inflammation and pain in the body. While NSAIDs can be effective at reducing pain and inflammation, they can also cause side effects like stomach ulcers and bleeding, so it's important to use them only as directed by a healthcare professional.