No, the Word 'not' is an adverb, a Word used to modify a verb, an adjective, or another adverb.
A noun is a Word for a person, a place, or a thing.
EXAMPLES
- We are not getting a pony! (the adverb 'not' modifies the verb 'getting'; the noun is 'pony')
- The morning after our party, the room was notpretty. (the adverb 'not' modifies the adjective 'pretty'; the nouns are 'morning', 'party', and 'room')
- I can sing, but not very well. (the adverb 'not' modifies the adverb 'very'; there are no nouns in this sentence)
