What part of speech is the word long?

The word "long" can be several parts of speech depending on how it's used in a sentence:

* Adjective: Describing a noun. Example: "It was a long journey."

* Adverb: Modifying a verb, adjective, or another adverb. Example: "She waited long for him to arrive."

* Noun: A word that names a person, place, thing, or idea. Example: "How long is this road?"

* Interjection: Expressing a strong emotion. Example: "Long live the king!"

To determine the correct part of speech, look at its function in the sentence.