charlatan vs mountebank

charlatan and mountebank both are nouns.

Word	Noun	Adjective	Verb	Adverb
charlatan	Yes	No	No	No
mountebank	Yes	No	No	No

As nouns, charlatan and mountebank are synonyms defined as:

charlatan and mountebank: a flamboyant deceiver; one who attracts customers with tricks or jokes

charlatan (noun)	mountebank (noun)
a flamboyant deceiver; one who attracts customers with tricks or jokes	a flamboyant deceiver; one who attracts customers with tricks or jokes