luridness vs grimness

luridness and grimness both are nouns.

Word	Noun	Adjective	Verb	Adverb
luridness	Yes	No	No	No
grimness	Yes	No	No	No

As nouns, luridness and grimness are synonyms defined as:

Other synonyms of luridness include ghastliness, gruesomeness.

luridness (noun)	grimness (noun)
the quality of being ghastly	something hard to endure
unnatural lack of color in the skin (as from bruising or sickness or emotional distress)	the quality of being ghastly
the journalistic use of subject matter that appeals to vulgar tastes