Viperoid is a term used to describe anything that resembles or has characteristics of a viper snake. Some synonyms that can be used in place of Viperoid are viperine, viperish, and viperous. Viperine refers to anything viper-like or having qualities of a viper. Viperish, on the other hand, refers to anything that is snakelike, venomous, or hostile in nature. Finally, viperous is a term used to describe anything that is venomous or nasty in behavior. All these synonyms can be used interchangeably with Viperoid to describe anything with viper-like characteristics.