SOPORIFEROUS Scrabble 17 Words With Friends 19 Definition adjective sleep inducing. — synonyms: soporific, somniferous, somnific, hypnogogic, hypnagogic adjective inducing mental lethargy. — synonyms: narcotic, soporific See all 372 words you can make from SOPORIFEROUS → 12-letter words Words starting with S Words ending with S ← Unscramble different letters