Venomous. Poisonous is when you die from eating it (like a pufferfish). Sorry if I come off as pedantic, I just see this very often and think it’s a pretty basic distinction.
Most venom isn’t poisonous, as your gastric juices denature the proteins and enzymes which make them dangerous. Big HOWEVER though, is that if you have a cut or any route to your bloodstream in your mouth or throat... then you can be envenomated that way. In addition some animals are both venemous and poisonous, such as tarantulas with urticating hairs.