spruce beer vs brew

spruce beer and brew both are nouns.

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

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

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

Other hypernyms of spruce beer include brewage.

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

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