indescribability vs indescribableness

indescribability and indescribableness both are nouns.

Word	Noun	Adjective	Verb	Adverb
indescribability	Yes	No	No	No
indescribableness	Yes	No	No	No

As nouns, indescribability and indescribableness are synonyms defined as:

indescribability and indescribableness: The quality or state of being impossible, or very difficult to describe.

indescribability (noun)	indescribableness (noun)
The quality or state of being impossible, or very difficult to describe.	The quality or state of being impossible, or very difficult to describe.