distressfulness vs seriousness

distressfulness and seriousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
distressfulness	Yes	No	No	No
seriousness	Yes	No	No	No

As nouns, distressfulness and seriousness are synonyms defined as:

distressfulness and seriousness: the quality of arousing fear or distress

distressfulness (noun)	seriousness (noun)
the quality of arousing fear or distress	the trait of being serious
	the quality of arousing fear or distress
	an earnest and sincere feeling