ghastliness vs gruesomeness

ghastliness and gruesomeness both are nouns.

Word	Noun	Adjective	Verb	Adverb
ghastliness	Yes	No	No	No
gruesomeness	Yes	No	No	No

As nouns, ghastliness and gruesomeness are synonyms defined as:

Other synonyms of ghastliness include grimness, luridness.

ghastliness (noun)	gruesomeness (noun)
the quality of being ghastly	the quality of being ghastly