The antonyms for the word "cooperators" include individuals who work alone and do not collaborate, such as competitors or rivals. They are more concerned with their own interests rather than working towards a common goal. Distractors are also antonyms of cooperators as they tend to hinder collective efforts and cause disruptions in team activities. Detractors, who criticize or disapprove of group goals or objectives, may also be antonyms of cooperators. Lastly, freeloaders are individuals who take advantage of the efforts of others without contributing anything themselves, and thus, are not working collaboratively.