stupid vs confused

stupid is a noun but confused is not a noun.

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

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

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