What part of speech is the word fluff?

"Fluff" can be several parts of speech depending on its use:

* Noun: A soft, light, and airy substance (e.g., "The cat slept on a bed of fluff.")

* Verb: To make something lighter and airier (e.g., "Fluff the pillows before bed.")

* Adjective: Soft, light, and airy (e.g., "The fluffiest pancakes I've ever had.")

* Informal: A light, unimportant thing (e.g., "Don't pay any attention to that fluff, it's just gossip.")

So, the answer depends on the context of the sentence!