dense vs stupid

dense is not a noun while stupid is a noun.

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

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

dense (adjective)	stupid (adjective)
having high relative density or specific gravity	lacking or marked by lack of intellectual acuity
hard to pass through because of dense growth	lacking intelligence
slow to learn or understand; lacking intellectual acuity	in a state of mental numbness especially as resulting from shock
permitting little if any light to pass through because of denseness of matter
having component parts closely crowded together