/ rhymes. 159 Hallucinogen Hallucinogen Definition: The general group of pharmacological agents can be divided into three broad categories: psychedelics, dissociatives, and deliriants.. Wikipedia suggests Hallucinogen . Hallucinogen contains 12 letters and has 159 connections / rhymes. 274 Halogen Halogen Definition: |}. Wikipedia suggests Halogen . Halogen contains 7 letters and