What part of speech is junk?

"Junk" can be a few different parts of speech, depending on how it's used in a sentence:

* Noun: This is the most common usage. It refers to something useless or discarded.

* Example: "I threw away the old junk in the garage."

* Adjective: It can describe something as worthless or of poor quality.

* Example: "I bought a junk car for cheap."

* Verb: It can mean to discard or throw away something. (This is less common)

* Example: "I need to junk this old couch."

So, to determine the part of speech, you need to look at the context of the sentence.