The antonyms for the word "sustainers" refer to entities that do not provide or maintain support, nourishment, or resources. These include words such as "opposers," "detractors," "disrupters," "obstructers," "opponents," and "adversaries." These terms imply forces that hinder or work against the sustenance or continuation of something. They may describe individuals or groups who actively try to thwart progress, growth, or stability. In contrast, sustainers are those who provide the necessary resources and support to ensure the smooth functioning and growth of a system or organization. They are crucial for maintaining stability, resiliency, and progress in any given context.