craniologist vs mountebank

craniologist and mountebank both are nouns.

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

As nouns, mountebank is a hypernym of craniologist; that is, mountebank is a word with a broader meaning than craniologist:

craniologist: someone who claims to be able to read your character from the shape of your skull
mountebank: a flamboyant deceiver; one who attracts customers with tricks or jokes

Other hypernyms of craniologist include charlatan.

craniologist (noun)	mountebank (noun)
someone who claims to be able to read your character from the shape of your skull	a flamboyant deceiver; one who attracts customers with tricks or jokes