dense vs denseness

dense is not a noun while denseness is a noun.

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

dense (noun)	denseness (noun)
	the amount per unit size
	the spatial property of being crowded together
	the quality of being mentally slow and limited

dense (adjective)	denseness (adjective)
having high relative density or specific gravity
hard to pass through because of dense growth
slow to learn or understand; lacking intellectual acuity
permitting little if any light to pass through because of denseness of matter
having component parts closely crowded together