Is the word fancy a noun?

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

Noun:

* Meaning: A whim, a sudden desire, or a liking.

* Example: "She had a sudden fancy for ice cream."

Adjective:

* Meaning: Elaborate, stylish, or expensive.

* Example: "She wore a fancy dress to the party."

So, the answer to your question is: Yes, "fancy" can be a noun.