What part of speech is sugar?

"Sugar" can be a few different parts of speech depending on how it's used in a sentence:

* Noun: This is the most common usage. "I put two teaspoons of sugar in my coffee."

* Adjective: Describing something as sweet like "sugar plums" or "sugar cookies".

Let me know if you have a specific sentence in mind and I can help you determine the part of speech!