relative density vs density

relative density and density both are nouns.

Word	Noun	Adjective	Verb	Adverb
relative density	Yes	No	No	No
density	Yes	No	No	No

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

relative density: the ratio of the density of something to the density of a standard
density: the amount per unit size

Other hypernyms of relative density include denseness.

relative density (noun)	density (noun)
the ratio of the density of something to the density of a standard	the amount per unit size
	the spatial property of being crowded together