changeling vs idiot

changeling and idiot both are nouns.

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

As nouns, changeling and idiot are synonyms defined as:

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

changeling (noun)	idiot (noun)
a child secretly exchanged for another in infancy	a person of subnormal intelligence
a person of subnormal intelligence