What part of speech is the word American?

The word "American" can be several parts of speech, depending on its use in a sentence:

* Adjective: Describing something as belonging to or relating to the United States of America.

* Example: "She is an American citizen."

* Noun: A person who is a citizen or resident of the United States of America.

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

* Noun: A person who is a native of the Americas (North, Central, or South America).

* Example: "The American indigenous tribes have a rich history."

So, without context, it's impossible to definitively say which part of speech "American" is. You need to consider the sentence it's used in.