witches' brew vs miscellany

witches' brew and miscellany both are nouns.

Word	Noun	Adjective	Verb	Adverb
witches' brew	Yes	No	No	No
miscellany	Yes	No	No	No

As nouns, miscellany is a hypernym of witches' brew; that is, miscellany is a word with a broader meaning than witches' brew:

Other hypernyms of witches' brew include assortment, miscellanea, mixed bag, mixture, motley, potpourri, salmagundi, smorgasbord, variety.

witches' brew (noun)	miscellany (noun)
a fearsome mixture	an anthology of short literary pieces and poems and ballads etc.
	a collection containing a variety of sorts of things