(n.) One who, or that which, whirls.

Ferris wheel Highland games Olympiad Olympic games chute-the-chutes chutes disk field day flying horses games gymkhana meet merry-go-round rally regatta roller roller coaster rolling stone rotator rotor roundabout rundle seesaw swing teeter-totter the Olympics top tournament tourney track meet wheel whip whirlabout whirler whirligig