thorniness vs bristliness

thorniness and bristliness both are nouns.

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

As nouns, thorniness and bristliness are synonyms defined as:

thorniness and bristliness: the quality of being covered with prickly thorns or spines

Other synonyms of thorniness include prickliness, spininess.

thorniness (noun)	bristliness (noun)
the quality of being covered with prickly thorns or spines	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.