permeability vs porousness

permeability and porousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
permeability	Yes	No	No	No
porousness	Yes	No	No	No

As nouns, porousness is a hypernym of permeability; that is, porousness is a word with a broader meaning than permeability:

permeability: the property of something that can be pervaded by a liquid (as by osmosis or diffusion)
porousness: the property of being porous; being able to absorb fluids

Other hypernyms of permeability include porosity.

permeability (noun)	porousness (noun)
the property of something that can be pervaded by a liquid (as by osmosis or diffusion)	the property of being porous; being able to absorb fluids