Swank is an idiomatic word that is used to describe something that is stylish, sophisticated, or luxurious. It is commonly used to describe one's appearance or a place or thing that is impressive. However, there are several synonyms that can be used to convey the same meaning as swank. Some of these include: chic, posh, elegant, refined, high-class, classy, exclusive, luxurious, grand, and fashionable. Depending on the context, any of these words can be used instead of swank to describe something that is impressive or stylish.