The word "tumbrils" is a term that is rarely used in everyday language, and it is primarily associated with the French Revolution. Therefore, it is not surprising that alternatives for this word are not commonly available. However, if you are looking for synonyms for "tumbrils," there are a few options worth considering. Some possible alternatives include carts, wagons, drays, and conveyances. These words can be used in place of "tumbrils" when referring to a vehicle used to transport prisoners or goods. While they may not be perfect substitutes, they can help convey the same message in a more accessible way.