Horse buggy, also known as horse-drawn carriage, is a mode of transportation that used to be common in the 19th and early 20th centuries. The term "horse buggy" can be used interchangeably with "horse-drawn carriage," "coach," or "trap." However, not everyone is familiar with this term. So, what are some antonyms for the word "horse buggy"? One word that comes to mind is "automobile." The invention of the automobile made horse buggies obsolete, and today, cars are the primary mode of transportation. Another word that could be used as an antonym is "bus," which refers to a large public transportation vehicle that operates on a schedule.