The word "whirligig" has several synonyms that can be used to describe something that is constantly rotating, spinning or twirling. Some of these synonyms include top, spinner, twirler, gyrator, and rotor. Additionally, the term "most whirligig" can be replaced with words such as "most dizzying," "most dizzy-making," or "most head-spinning." These words emphasize the rapid and disorienting nature of the whirligig motion. Overall, there are many synonyms for the term "most whirligig" that can convey the same sense of movement and rapidity while adding variety and nuance to language.