Is won't a noun

Answer 1

It is a contraction, and only part of an actual verb. It means "will not" where will is an auxiliary or helper verb, and not is a negative adverb. To have a meaning, "won't" must be followed by another verb, or an understood verb.

Examples:

I won't tell you the answer.

You want me to go? I won't. (go)

Answer 2

No, the word won't is a contraction of a verb phrase. It means "will not."

The contraction is a combination of the obsolete verb "wont" (to become or cause to become accustomed) and the adverb "not".

The contraction won't functions as an auxiliary verb (and negative adverb) in a sentence.

Example:

I will not forget to pick up the milk. OR: I won't forget to pick up the milk.