The word "circulators" refers to objects or devices that facilitate the circulation or movement of fluids or gases. The antonyms for "circulators" would be objects or devices that obstruct, restrict or impede the flow of fluids or gases. Some possible antonyms for "circulators" could include blockers, stoppers, inhibitors, cloggers, barriers, or obstacles. Conversely, objects or devices that assist with the flow of fluids or gases could be considered synonyms or alternative words for "circulators." These could include pumps, fans, compressors, turbines, or ventilators. Understanding antonyms and synonyms can help to expand one's vocabulary and improve communication skills.