The term "major tranquilizer" refers to drugs that have the ability to calm and sedate patients. However, there are several synonyms for this term that have different connotations and intentions. One commonly used synonym is "neuroleptic," which implies that the drug has an effect on the nervous system. Another synonym is "antipsychotic," which refers to drugs used to treat psychosis such as schizophrenia. "Sedative-hypnotic" is also used to describe drugs that induce sleep and relaxation. Finally, "anxiolytic" is a term used for drugs that reduce anxiety and tension. These synonyms are useful for categorizing different drugs based on their specific effects and uses.