idiot vs cretin

idiot and cretin both are nouns.

Word	Noun	Adjective	Verb	Adverb
idiot	Yes	No	No	No
cretin	Yes	No	No	No

As nouns, idiot and cretin are synonyms defined as:

Other synonyms of idiot include changeling, half-wit, imbecile, moron, retard.

idiot (noun)	cretin (noun)
a person of subnormal intelligence	a person of subnormal intelligence