What part of speech is the word out in sentence watch for that poisonous snake?

In the sentence "Watch out for that poisonous snake!", the word "out" is an adverb.

Here's why:

* Adverbs modify verbs, adjectives, or other adverbs. In this case, "out" modifies the verb "watch" by telling us *how* to watch.

* It answers the question "how?" You're not just watching, you're watching "out" for the snake.

Let me know if you have any other questions!