craniologist vs charlatan

craniologist and charlatan both are nouns.

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

As nouns, charlatan is a hypernym of craniologist; that is, charlatan 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
charlatan: a flamboyant deceiver; one who attracts customers with tricks or jokes

Other hypernyms of craniologist include mountebank.

craniologist (noun)	charlatan (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