penetrability vs perviousness

penetrability and perviousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
penetrability	Yes	No	No	No
perviousness	Yes	No	No	No

As nouns, penetrability and perviousness are synonyms defined as:

penetrability and perviousness: the quality of being penetrable (by people or light or missiles etc.)

penetrability (noun)	perviousness (noun)
the quality of being penetrable (by people or light or missiles etc.)	the quality of being penetrable (by people or light or missiles etc.)