idiot savant vs simpleton

idiot savant and simpleton both are nouns.

Word	Noun	Adjective	Verb	Adverb
idiot savant	Yes	No	No	No
simpleton	Yes	No	No	No

As nouns, simpleton is a hypernym of idiot savant; that is, simpleton is a word with a broader meaning than idiot savant:

idiot savant: person who is mentally retarded in general but who displays remarkable aptitude in some limited field (usually involving memory)
simpleton: a person lacking intelligence or common sense

Other hypernyms of idiot savant include simple.

idiot savant (noun)	simpleton (noun)
person who is mentally retarded in general but who displays remarkable aptitude in some limited field (usually involving memory)	a person lacking intelligence or common sense