https://www.merriam-webster.com/dictionary/poison

“a substance that through its chemical action usually kills, injures, or impairs an organism”

Poison doesn’t have to be swallowed

Poison is generic. Venom is specific to normal method of delivery (e.g. snakes and bees).

Swallowing venom may or may not hurt you. Probably not a great idea, but there’s a better chance you’ll be okay.

Getting a known poison stabbed/injected intravenously seems likely to be pretty effective, but it depends on the mode of action. Blood goes everywhere in the body, so it will likely find its target eventually.

That’s for poisonous vs venomous, but poison is a generic term, the substance won’t care how it got into your bloodstream.

Alternatively, his blade was not very deadly unless he got it in someone’s mouth.

Yes, but he said it was coated in poison, not venom. Licking it was a proper way to administer the dose.