The term "was member of" implies that someone was part of a particular group, organization, or team. There are several synonyms for this phrase that can be used to convey the same meaning. These include "belonged to," "was part of," "was affiliated with," "was a participant in," and "was involved in." Each of these phrases can be used interchangeably with "was member of" to describe someone's affiliation with a specific entity. It's important to consider the context in which these synonyms are used to ensure the meaning is accurate and clear.