Tumbril is a term with a specific meaning that describes a two-wheeled cart used to transport prisoners, especially to the guillotine during the French Revolution. Synonyms for tumbril include transporter, cart, wagon, and carriage. Similar words could also include a chariot, a flatbed, a dray, or even a bier. Some variations could include using a trolley, a sled, or a in some cases a wheelbarrow. These synonyms can be used in different contexts and for different purposes, however, it is important to understand the nuances of language and to use words appropriately depending on the situation and objective.