The word "co-referent" refers to two or more expressions that refer to the same entity or object. It is a term commonly used in linguistics and semantics. Synonyms for "co-referent" include "referring to the same entity", "co-referential", "referring to the same referent" and "having the same reference". Other similar words include "synonymous", "interchangeable", "corresponding", "equivalent", "identical", "parallel", and "similar". These synonyms can be used in various contexts to convey the idea of two or more expressions referring to the same thing. Understanding these synonyms can help to express language more precisely and accurately.