There are several synonyms for the word "omnibuses." One of the most common synonyms is "buses." This word is frequently used in modern English to describe large public transportation vehicles that carry passengers from one location to another. Another synonym for "omnibuses" is "coaches." This term is often used to describe larger, more spacious buses that are often used for long-distance travel. Other synonyms for "omnibuses" include "shuttle buses," "trolley buses," and "streetcars." Each of these terms describes a specific type of public transportation vehicle, and all are used interchangeably depending on the context of the conversation.