What part of speech is buzz?

"Buzz" can be multiple parts of speech depending on its use in a sentence:

* Noun: The sound made by bees. "The buzz of the hive was deafening."

* Verb: To make a sound like a bee. "The mosquitoes buzzed around my head."

* Adjective: Full of activity and excitement. "The city was buzzing with life."

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