confused vs stupid

confused is not a noun while stupid is a noun.

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

confused (noun)	stupid (noun)
	a person who is not very bright

confused (adjective)	stupid (adjective)
mentally confused; unable to think with clarity or act intelligently	lacking or marked by lack of intellectual acuity
thrown into a state of disarray or confusion	lacking intelligence
lacking orderly continuity	in a state of mental numbness especially as resulting from shock
perplexed by many conflicting situations or statements; filled with bewilderment
having lost your bearings; confused as to time or place or personal identity