What is the word little it a noun or an adjective?

"Little" can be both a noun and an adjective, depending on how it's used.

As an adjective:

* "The little girl was playing in the park." (Describing the size of the girl)

* "He had a little money left." (Describing the amount of money)

As a noun:

* "He's just a little." (Referring to a small child or person)

* "The little of what he knew was useless." (Referring to a small amount)

So, it's important to look at the context to determine its part of speech.