The word adverb is a noun. However, adverbs (the words that modify verbs, adjectives, and other adverbs) are their own part of speech.
adverb
Adverb
Adverb
adverb
"Ever" is an adverb.
adverb
about is a adverb.
Twice is an adverb.
Commonly is an adverb.
Hysterically is an adverb.
Beautifully is an adverb.
adverb