Synonyms of the word

yeast

• n. An often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread,…
• n. A single-celled fungus of a wide variety of taxonomic families.
• n. (figuratively) A frothy foam.
• v. To ferment.
• v. (of something prepared with a yeasted dough) To rise.
• v. (African American Vernacular, slang) To exaggerate.

barm

• n. (obsolete except in dialects) Bosom, lap.
• n. Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and…
• n. A small, flat, round individual loaf or roll of bread.

fungus

• n. (mycology) Any member of the kingdom Fungi; a eukaryotic organism typically having chitin cell walls but…

leaven

• n. Any agent used to make dough rise or to have a similar effect on baked goods.
• n. (figuratively) Anything that makes a general assimilating change in the mass.
• v. (transitive) To add a leavening agent.
• v. (transitive) To cause to rise by fermentation.
• v. (transitive, figuratively) To temper an action or decision.
• v. (transitive, figuratively) To imbue; to infect; to vitiate.
• v. To rise or become larger.

leavening

• adj. made light by aeration.
• n. a leavening agent.