Cothurnus refers to a type of high, thick-soled, laced boot traditionally worn by ancient Greek tragic actors. As a relatively rare word, synonyms for cothurnus are not particularly common, although other similar terms may be used in certain contexts. Possible synonyms for cothurnus might include terms such as "buskin," "elevator shoe," or "platform boot." These words all describe footwear with a high, often thick sole that can elevate the wearer's height. However, each of these terms may be more or less appropriate depending on the specific context in which they are used.