Mountebank is a word that is not commonly used nowadays, but when it is, people often associate it with a swindler or quack. If you are looking for synonyms for this word, you might want to consider charlatan, imposter, trickster, fraud, scammer, or deceiver. These words all describe someone who pretends to be something they are not, usually for personal gain. Other synonyms include cheat, sham, phony, impostor, and faker. Some may even use the word con artist, confidence man, or hustler to describe someone who is a mountebank. No matter which word you choose, they all imply a level of deceit and dishonesty.