The phrase "of them" is frequently used in English to refer to a group of people or things. However, there are many synonyms that can be used in place of "of them" to provide greater clarity or variety in writing or speech. Some examples of synonyms for "of them" include "among them," "in their midst," "within their number," "amidst their ranks," "part of their company," and "part of their group." Utilizing these alternative expressions can help to vary your language and add greater precision to your writing or speech.