Exotic smoothie ingredients include guava (5 letters) and acai (4 letters). Guava is a tropical fruit native to Central America, the Caribbean, and parts of South America. It has a sweet flavor and is often used in juices and smoothies. Acai is a berry native to the Amazon rainforest. It is high in antioxidants and has a sweet, tart flavor. Both guava and acai are popular ingredients in exotic smoothies.