brew vs kvass

brew and kvass both are nouns.

Word	Noun	Adjective	Verb	Adverb
brew	Yes	No	Yes	No
kvass	Yes	No	No	No

As nouns, kvass is a hyponym of brew; that is, kvass is a word with a more specific, narrower meaning than brew:

brew: drink made by steeping and boiling and fermenting rather than distilling
kvass: fermented beverage resembling beer but made from rye or barley

Other hyponyms of brew include beer, mead, cassiri, spruce beer.

brew (noun)	kvass (noun)
drink made by steeping and boiling and fermenting rather than distilling	fermented beverage resembling beer but made from rye or barley

brew (verb)	kvass (verb)
sit or let sit in boiling water so as to extract the flavor
prepare by brewing