flux density vs denseness

flux density and denseness both are nouns.

Word	Noun	Adjective	Verb	Adverb
flux density	Yes	No	No	No
denseness	Yes	No	No	No

As nouns, denseness is a hypernym of flux density; that is, denseness is a word with a broader meaning than flux density:

flux density: (physics) the number of changes in energy flow across a given surface per unit area
denseness: the amount per unit size

Other hypernyms of flux density include density.

flux density (noun)	denseness (noun)
(physics) the number of changes in energy flow across a given surface per unit area	the amount per unit size
	the spatial property of being crowded together
	the quality of being mentally slow and limited