Gilman reagent is a type of organocopper compound commonly used in organic synthesis. However, there are several other synonyms for Gilman reagent that are often used interchangeably. These include cuprate, organocopper compound, R2CuLi, and R2CuMgX. Cuprate refers to any compound containing a copper atom in which the copper is in an oxidation state of less than three. Organocopper compound is a broader term that encompasses any compound containing both copper and carbon atoms. R2CuLi and R2CuMgX refer to specific types of Gilman reagents in which the copper is bonded to lithium or magnesium respectively. Thus, depending on the specific context, different synonyms may be used to refer to Gilman reagents.