What part of speech is the word night in following sentence you watched a game on TV last night?

The word "night" in the sentence "You watched a game on TV last night" is an adverb.

Here's why:

* Adverbs modify verbs, adjectives, or other adverbs.

* In this sentence, "night" modifies the verb "watched," telling us when the action took place.

Let me know if you'd like to see other examples!