The word 'rapidly' is an adverb, a word that modifies a verb, an adjective, or another adverb. Example:
The boy rapidly ran to catch the ball before it could hit the ground.
No - the word "rapidly" is an adverb.
The word rapidly is an adjective. no
more rapidly
more rapidly and most rapidly
more rapidly, most rapidly
Yes, the word 'classifier' is a noun, a word for one who classifies (a person); a word for a device for separating solids of different characteristics (a thing).
He rapidly drove through the puddle.The police arrived rapidly.
slowly
slowly
gobble
The train was rapidly rolling down the track.
I swam rapidly trying to get to the finish line before my oppenent did. RAPIDLY MEANS VERY FAST