Manias, which refers to an intense or extreme obsession or preoccupation with something, has several synonyms. One synonym is obsession, which is a persistent feeling or idea that occupies one's mind. Fanaticism is another synonym for manias, which describes an irrational and extreme enthusiasm or passion for something, often leading to excessive actions or behavior. A third synonym for manias is addiction, which is a dependency or habituation to a particular substance or activity. Lastly, compulsion is also a synonym for manias, which refers to the irresistible urge to engage in a specific behavior or activity despite its negative consequences.