kvass vs brew

kvass and brew both are nouns.

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

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

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

Other hypernyms of kvass include brewage.

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

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