The word "more oversweet" implies that something is overly sweet, cloying, or too saccharine. Synonyms for this might include words such as sickly sweet, excessively sugary, syrupy, or treacly. Other options could include overly saccharine, too sugared, cloyingly honeyed, or excessively sweetened. Depending on the context, there may be other words that more accurately capture the sense of too much sweetness, such as sticky, gooey, or candy-like. Ultimately, the choice of synonym will depend on the nuances of the situation and the intended tone of the speaker or writer.