retarded vs simple

retarded and simple both are nouns.

Word	Noun	Adjective	Verb	Adverb
retarded	Yes	Yes	No	No
simple	Yes	Yes	No	No

retarded (noun)	simple (noun)
people collectively who are mentally retarded	a person lacking intelligence or common sense
	any herbaceous plant having medicinal properties

retarded (adjective)	simple (adjective)
relatively slow in mental or emotional or physical development	(botany) of leaf shapes; of leaves having no divisions or subdivisions
	having few parts; not complex or complicated or involved
	easy and not involved or complicated
	exhibiting childlike simplicity and credulity
	unornamented
	lacking mental capacity and subtlety
	apart from anything else; without additions or modifications