| Word | Definitions | Synonyms |
|---|---|---|
| sopor | (noun) a torpid state resembling deep sleep | Synonyms: sleep |
| soporiferous | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somniferous, somnific, soporific |
| (adjective) inducing mental lethargy | Synonyms: narcotic, soporific | |
| soporific | (adjective) sleep inducing | Synonyms: hypnagogic, hypnogogic, somniferous, somnific, soporiferous |
| (adjective) inducing mental lethargy | Synonyms: narcotic, soporiferous | |
| (noun) a drug that induces sleep | Synonyms: hypnotic |