It can be a noun "a pedal" or a verb "to pedal".
I pedaled my bike hard.
Yes, quickly is an adverb. "He pedaled quickly on his bike." Quickly tells how he pedaled. It modifies the verb.
part of speech
The part of speech for this particular word is a noun.
"Pedaled" and "petaled" are homophones for "peddled."
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "explicit" is an adjective.
The part of speech for "twirl" is a verb.
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.