retarded vs stupid

retarded and stupid both are nouns.

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

retarded (noun)	stupid (noun)
people collectively who are mentally retarded	a person who is not very bright

retarded (adjective)	stupid (adjective)
relatively slow in mental or emotional or physical development	lacking or marked by lack of intellectual acuity
	lacking intelligence
	in a state of mental numbness especially as resulting from shock