Triple decker is often used to refer to a sandwich or a building with three floors. However, there are many synonyms for this term, depending on the context. Some synonyms for triple decker sandwich include the clubhouse, the Dagwood, and the Big Boy sandwich. For buildings, synonyms for triple decker include three-story, triplex, and three-level. In the transportation industry, triple decker can be replaced with triple-tier, three-level, and triple-decker train. No matter the context, each of these synonyms conveys the idea of a structure or object that has three levels or layers. These synonyms can add variety to language and can help to avoid repetitive word usage.