What part of speech is the word Australian?

"Australian" can be a few different parts of speech, depending on its use:

* Adjective: Describing something as being from or relating to Australia.

* Example: "The Australian flag is blue, white, and red."

* Noun: Referring to a person from Australia.

* Example: "The Australian won the gold medal."

* Nationality: A term indicating someone's nationality.

* Example: "Her nationality is Australian."

So, the specific part of speech depends on the context of the sentence.