acerbity vs thorniness

acerbity and thorniness both are nouns.

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

As nouns, acerbity and thorniness are synonyms defined as:

Other synonyms of acerbity include acrimony, bitterness, jaundice, tartness.

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