foolish vs stupid

foolish is not a noun while stupid is a noun.

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

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

foolish (adjective)	stupid (adjective)
devoid of good sense or judgment	lacking or marked by lack of intellectual acuity
having or revealing stupidity	lacking intelligence
	in a state of mental numbness especially as resulting from shock