BECU is an acronym that stands for Boeing Employees Credit Union. As such, there are a few synonymous terms that can be used to refer to BECU. For example, one could refer to BECU as a financial institution or a credit union. Other synonyms for BECU might include banking cooperative, savings and loan association, or financial cooperative. Essentially, any term that refers to a nonprofit financial organization that provides services to its members could be considered a synonym for BECU. Other potential synonyms might include terms like lending institution, credit society, or investment company. Ultimately, the specific synonym chosen will depend on the context in which the term is being used and the writer or speaker's preferred phrasing.