Synonyms for Whirligig (same or very similar meaning)
WordNet sense 1 (a conical child's plaything tapering to a steel point on which it can be made to spin):
top, teetotum, spinning topWordNet sense 2 (large mechanical apparatus with seats for children to ride on):
carousel, carrousel, merry-go-round, roundaboutFrom the ODE community, based on WordNetadd/edit