porosity vs porousness

porosity and porousness both are nouns.

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

As nouns, porosity and porousness are synonyms defined as:

porosity and porousness: the property of being porous; being able to absorb fluids

porosity (noun)	porousness (noun)
the property of being porous; being able to absorb fluids	the property of being porous; being able to absorb fluids