motorcycle vs scrambler

motorcycle and scrambler both are nouns.

As nouns, scrambler is a hyponym of motorcycle; that is, scrambler is a word with a more specific, narrower meaning than motorcycle:

motorcycle: a motor vehicle with two wheels and a strong frame
scrambler: a lightweight motorcycle equipped with rugged tires and suspension; an off-road motorcycle designed for riding cross country or over unpaved ground

Other hyponyms of motorcycle include minibike, motorbike, dirt bike, trail bike.

motorcycle (noun)	scrambler (noun)
a motor vehicle with two wheels and a strong frame	a rapid mover; someone who scrambles
	a lightweight motorcycle equipped with rugged tires and suspension; an off-road motorcycle designed for riding cross country or over unpaved ground
	electronic equipment that makes speech unintelligible during transmission and restores it at reception

motorcycle (verb)	scrambler (verb)
ride a motorcycle