scrambler

(noun) a rapid mover; someone who scrambles. Examples: "Their quarterback was a good scrambler." "Scramblers can often unnerve a better tennis player."

(noun) a lightweight motorcycle equipped with rugged tires and suspension; an off-road motorcycle designed for riding cross country or over unpaved ground. Synonyms: trail bike, dirt bike.

(noun) electronic equipment that makes speech unintelligible during transmission and restores it at reception.