porousness vs porosity

porousness and porosity both are nouns.

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

As nouns, porousness and porosity are synonyms defined as:

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

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