barm vs yeast

barm and yeast both are nouns.

Word	Noun	Adjective	Verb	Adverb
barm	Yes	No	No	No
yeast	Yes	No	No	No

As nouns, barm and yeast are synonyms defined as:

barm and yeast: a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey

barm (noun)	yeast (noun)
a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey	any of various single-celled fungi that reproduce asexually by budding or division
	a commercial leavening agent containing yeast cells; used to raise the dough in making bread and for fermenting beer or whiskey