thorny vs thorniness

thorny is not a noun while thorniness is a noun.

Word	Noun	Adjective	Verb	Adverb
thorny	No	Yes	No	No
thorniness	Yes	No	No	No

thorny (noun)	thorniness (noun)
	the quality of being covered with prickly thorns or spines
	a rough and bitter manner
	The property of being full of difficulties, complexities, or controversial points.

thorny (adjective)	thorniness (adjective)
having or covered with protective barbs or quills or spines or thorns or setae etc.
bristling with perplexities