Obsessive Compulsive Disorder (OCD) is a mental disorder that is characterized by intrusive thoughts, repetitive behaviors, and excessive anxiety. It is a serious condition that affects millions of people worldwide. There are several synonyms for OCD which include anxiety disorder, compulsive-obsessive syndrome, obsessive-compulsive neurosis, and obsessive-compulsive spectrum disorder. These synonyms are used to refer to the same condition and they are used interchangeably by professionals and individuals experiencing the disorder. It is important to note that OCD is a treatable condition and it is important to seek professional help if you think you may be suffering from it. Early diagnosis and treatment are essential to managing this disorder.