stupid vs foolish

stupid is a noun but foolish is not a noun.

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

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

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