brew vs spruce beer

brew and spruce beer both are nouns.

Word	Noun	Adjective	Verb	Adverb
brew	Yes	No	Yes	No
spruce beer	Yes	No	No	No

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

brew: drink made by steeping and boiling and fermenting rather than distilling
spruce beer: a brew made by fermenting molasses and other sugars with the sap of spruce trees (sometimes with malt)

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

brew (noun)	spruce beer (noun)
drink made by steeping and boiling and fermenting rather than distilling	a brew made by fermenting molasses and other sugars with the sap of spruce trees (sometimes with malt)

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