spininess vs bristliness

spininess and bristliness both are nouns.

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

As nouns, spininess and bristliness are synonyms defined as:

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

Other synonyms of spininess include prickliness, thorniness.

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