YEAST /iːst/ ► audio Scrabble 8 Words With Friends 7 Definition noun a commercial leavening agent containing yeast cells. — synonyms: barm noun any of various single-celled fungi that reproduce asexually by budding or division. See all 44 words you can make from YEAST → 5-letter words Words starting with Y Words ending with T ← Unscramble different letters