There are several synonyms for the word "prewarmed". Some examples include "preheated", which suggests the use of heat to prepare an object for further use; "warmed up", which means to bring something up to the desired temperature before use; and "precooked", which refers to food that has been partially or fully prepared before serving. Other synonyms for "prewarmed" include "tempered", "conditioned", "primed", and "prepared". Overall, these words all suggest the act of preparing something in advance of its intended use, usually by applying some form of heat or other treatment to the object in question.