"Straphanger" is a word that commonly refers to someone using public transportation, standing and holding onto a strap or handle for support. However, there are many synonyms for this word. Commuter, traveler, passenger, rider, and transit-goer are just a few synonyms that can be used interchangeably with "straphanger" to describe people using public transportation. Additionally, terms like train rider, subway rider, and bus rider could also be used depending on what mode of transportation someone is using. While the term "straphanger" may be unique and specific, it's always good to have a variety of synonyms in your vocabulary to express yourself clearly in all situations.