What part of speech is the word icy?

"Icy" can be two parts of speech depending on how it's used:

* Adjective: Describing something that is like ice, such as "icy roads" or "an icy stare."

* Noun: A noun form of the adjective, referring to a frozen surface, like "the icy surface of the lake."

Let me know the context of the sentence, and I can tell you for sure which part of speech it is!