What part of speech is the word powerful?

"Powerful" can be several parts of speech, depending on how it's used in a sentence:

* Adjective: Describing a noun, such as "a powerful engine."

* Noun: A person or thing that has great power, such as "He is a powerful in the industry."

* Adverb: Modifying an adjective or verb, such as "He spoke powerfully about the issue."

To determine the correct part of speech, you need to look at the context of the sentence.