Nonvenomous refers to something that does not contain venom or poison. Antonyms for the word nonvenomous include venomous, poisonous, toxic, lethal, noxious, deadly, harmful, injurious, and virulent. Venomous animals such as snakes, spiders, and scorpions contain venom that can cause harm or death, whereas nonvenomous animals do not pose the same level of danger. Poisonous substances like arsenic, cyanide, and mercury can be fatal if ingested, while nonpoisonous substances are safe to consume. The terms venomous and poisonous are often used interchangeably but are distinct from each other, with venom being injected and poison being ingested or absorbed.