Difference between Barm and Yeast

Barm

Part of speech: noun

Definition: Bosom, lap. Foam rising upon beer, or other malt liquors, when fermenting, and used as leaven in making bread and in brewing; yeast. A small flat round, individual loaf, or roll of bread.

Yeast

Part of speech: noun

Definition: An often humid, yellowish froth produced by fermenting malt worts, and used to brew beer, leaven bread, and also used in certain medicines.A type of single-celled fungus.A compressed cake or dried granules of this substance used for mixing with flour to make bread dough rise.A frothy foam.

Part of speech: verb

Definition: To exaggerate

Example sentence: When I have any sort of diet that's high in sugar or yeast, I would find that my body would be very much out of whack.