beer vs brewage

beer and brewage both are nouns.

Word	Noun	Adjective	Verb	Adverb
beer	Yes	No	No	No
brewage	Yes	No	No	No

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

beer: a general name for alcoholic beverages made by fermenting a cereal (or mixture of cereals) flavored with hops
brewage: drink made by steeping and boiling and fermenting rather than distilling

Other hypernyms of beer include brew.

beer (noun)	brewage (noun)
a general name for alcoholic beverages made by fermenting a cereal (or mixture of cereals) flavored with hops	drink made by steeping and boiling and fermenting rather than distilling