What part of speech is the word iron?

"Iron" can be several parts of speech depending on its context:

* Noun: This is the most common usage, referring to the metallic element. Example: "The blacksmith hammered the iron into a horseshoe."

* Adjective: Meaning "made of iron" or "resembling iron." Example: "The iron bars on the window were strong."

* Verb: This is less common, meaning "to press or smooth with a hot iron." Example: "She ironed her dress before going out."

So, without context, it's impossible to determine the exact part of speech.