"Em" is a commonly used word that can be a bit tricky to find synonyms for. However, there are several words that you can use instead of "em," including "her," "him," "they," and "those." Each of these words can be used in the same context as "em" to refer to people or objects that are not present in the immediate conversation or situation. Depending on the context, you could also use synonyms like "that person," "that thing," or even "it" to refer to "em." By using these different synonyms, you can add variety and clarity to your writing or speaking.