baker's yeast vs yeast

baker's yeast and yeast both are nouns.

Word	Noun	Adjective	Verb	Adverb
baker's yeast	Yes	No	No	No
yeast	Yes	No	No	No

As nouns, yeast is a hypernym of baker's yeast; that is, yeast is a word with a broader meaning than baker's yeast:

baker's yeast: used as a leaven in baking and brewing
yeast: any of various single-celled fungi that reproduce asexually by budding or division

baker's yeast (noun)	yeast (noun)
used as a leaven in baking and brewing	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