Malacostran is a term used to describe a group of crustaceans, such as lobsters, crabs, and shrimps. However, there are several other words that can be used as a synonym for malacostran. Some of these words include decapod, which refers to crustaceans with ten legs, decapodiform, which describes cephalopods with ten tentacles, and macruran, which specifically refers to long-tailed crustaceans. Other possible synonyms include caridean, which refers to shrimp-like crustaceans, and stomatopod, which is a term used for mantis shrimps. Regardless of which term you choose, these words all refer to fascinating and diverse groups of marine creatures.