Synonyms for the word "retarders" can be categorized into several clusters. In the context of concrete or construction, the term "retarders" refers to substances that slow down the curing process of concrete, allowing for longer workability. Alternative terms for this specific type of retarders include "delay agents", "stabilizers" or "set time extenders". However, in other fields, the term "retarders" may have different connotations. In the medical realm, "inhibitors" or "suppressants" can be synonyms for retarders, as they refer to substances used to slow down or hinder the progression of a particular process or condition. In summary, synonyms for "retarders" depend on the context and can vary within different industries and fields.