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idiot is a type of:

• simpleton, simple (noun) - a person lacking intelligence or common sense

types of idiot:

• mongoloid (noun) - a person suffering from Down syndrome (no longer used technically in this sense)

idiot is derivationally related to:

• to check, retard, delay (verb) - slow the growth or development of
• cretinous (adjective) - afflicted with cretinism
• imbecile, imbecilic, idiotic (adjective) - having a mental age of three to seven years
• moronic (adjective) - having a mental age of between eight and twelve years