What part of speech is booming?

"Booming" can be a few different parts of speech, depending on how it's used in a sentence:

* Verb: Describing a loud sound, like "The cannon boomed across the valley."

* Adjective: Describing something that is successful and growing rapidly, like "The economy is booming."

* Adverb: Describing an action with great force or loudness, like "The lion roared boomingly."

To determine the part of speech, look at how it functions in the sentence!