Brewery Need is a term used to describe the four essential ingredients needed to make beer. YEAST (5 letters) is a microorganism that ferments the sugars in the malt and produces alcohol and carbon dioxide. OAST (4 letters) is a kiln used to dry malt, which is a grain that provides the sugars needed for fermentation. Malt (4 letters) also provides the flavor and color of the beer. Hops (4 letters) are the flowers of the hop plant, which provide bitterness and aroma to the beer.