Postum is a brand of roasted grain beverage and a great substitute for coffee. The word Postum is a brand name and there are several synonyms for it, such as Caffix, Pero, Teeccino, and Dandy Blend. These are all alternatives to traditional coffee that can give you a similar taste and flavor to coffee, without the caffeine. Some people prefer Postum or its synonyms because it's gluten-free, caffeine-free, and low in calories. Additionally, these beverages are a good option for people who are trying to reduce their caffeine intake for health reasons. Regardless of your preference, there is a variety of Postum synonyms available on the market that can give you a delicious alternative to coffee.