SARGASSUM Scrabble 12 Words With Friends 15 Definition noun brown algae with rounded bladders forming dense floating masses in tropical Atlantic waters as in the Sargasso Sea. — synonyms: gulfweed, sargasso, Sargassum_bacciferum See all 101 words you can make from SARGASSUM → 9-letter words Words starting with S Words ending with M ← Unscramble different letters