Akbar can speak Arabic fluently, because he had lived in Egypt for a year. The underlined word is which part of speech?

Akbar can speak Arabic fluently, because he had lived in Egypt for a year. The underlined word is which part of speech?
Answer: Adverb

“Fluently,” underlined, is an adverb modifying “speak.” Studying parts of speech highlights their role in sentence structure, providing lessons on grammatical clarity in English.