perviousness vs penetrability

perviousness and penetrability both are nouns.

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

As nouns, perviousness and penetrability are synonyms defined as:

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

perviousness (noun)	penetrability (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.)