thorniness vs acerbity

thorniness and acerbity both are nouns.

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

As nouns, thorniness and acerbity are synonyms defined as:

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

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