Narcous is a word used to describe something that induces a state of drowsiness or sleep. There are several synonyms for this word that one can use in writing or conversation to avoid repetition. One synonym is soporific, which refers to something that induces or tends to induce sleep. Another alternative is somnolent, which means sleepy or drowsy. Similarly, drowsy or slumberous can also be used to describe a narcous state. Other synonyms include hypnotic, sedative, and tranquilizing. By using these synonyms, one can effectively communicate the intended meaning without repeating the same word over and over again.