Coarctation is a medical term used to describe the narrowing or constriction of a blood vessel or artery. There are several synonyms that can be used in place of this term, some of which include stenosis, occlusion, constriction, and obstruction. Stenosis refers to the narrowing of a blood vessel or an artery due to an abnormal growth, while occlusion is a complete blockage of a blood vessel. Constriction and obstruction both refer to the constriction or blockage of a blood vessel or an artery. All of these terms are used interchangeably in the medical field and are often used to describe the same medical condition.