Assertion: yeast | /r/CreatedBy | fermenting malt worts
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Source sentences:
text: As nouns the difference between leaven and yeast is that leaven is any agent used to make dough rise or to have a similar effect on baked goods while yeast is an often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread, and also used in certain medicines.