inexorableness vs inexorable

inexorableness is a noun but inexorable is not a noun.

Word	Noun	Adjective	Verb	Adverb
inexorableness	Yes	No	No	No
inexorable	No	Yes	No	No

inexorableness (noun)	inexorable (noun)
mercilessness characterized by an unwillingness to relent or let up

inexorableness (adjective)	inexorable (adjective)
	not to be placated or appeased or moved by entreaty
	impervious to pleas, persuasion, requests, reason