NALC is an acronym that generally refers to the National Association of Letter Carriers, which is a labor union representing United States Postal Service (USPS) employees. However, there are a variety of synonyms that can be used to refer to the NALC, such as postal union, letter carrier union, and mailman association. These synonyms can be helpful when trying to describe the NALC in different contexts or to avoid using the same word repeatedly in a document or conversation. Other potential synonyms for NALC might include American Postal Workers Union (APWU), National Postal Mail Handlers Union (NPMHU), or the National Rural Letter Carriers' Association (NRLCA).