My even-more-pedantic take is that poisonous is correct, but imprecise. There’s lots of ways to be poisoned. Ingestion, inhalation, dermal contact, and, yes, injection. But it’s all poison.

A poison is a harmful substance. A toxin is a poison created by a living organism. A Venom is a toxin that’s delivered subcutaneously.

Poison is the parrallelogram to venom’s square.