painfulness vs distressingness

painfulness and distressingness both are nouns.

Word	Noun	Adjective	Verb	Adverb
painfulness	Yes	No	No	No
distressingness	Yes	No	No	No

As nouns, painfulness and distressingness are synonyms defined as:

painfulness (noun)	distressingness (noun)
the quality of being painful	the quality of being painful
emotional distress; a fundamental feeling that people try to avoid