* Adverb: This is the most common usage. It describes how something is done, e.g., "He did the job well."
* Interjection: This is used to express surprise, agreement, or other emotions. It's often used at the beginning of a sentence, e.g., "Well, that's interesting."
* Noun: It can refer to a deep hole in the ground, especially one with water. This is less common than the other uses. e.g., "The well was dry."
* Part of a phrase: It can be part of a phrase, such as "well-known" or "well-being."
The specific type of word "well" is, depends on its context in the sentence.