Can there be used as a noun?

The word "used" can be used as a noun, but only in a few specific cases, usually with a modifier. Here's a breakdown:

Not a noun on its own:

* "Used" alone is generally an adjective or part of the past participle of the verb "to use." For example: "I have a used car" (adjective), "They used the tool correctly" (verb).

Possible noun uses (with a modifier):

* "The used" can refer to a collection of things that are no longer new: "The used section of the bookstore had some interesting finds."

* "The used" can also refer to a particular type of thing: "They specialize in selling the used, but high-quality, furniture."

* "Used goods" or "used products" are common phrases: "They buy and sell used goods."

Overall: While "used" on its own is not a noun, it can function as one when combined with a modifier that provides context.