thorniness vs bitterness

thorniness and bitterness both are nouns.

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

As nouns, thorniness and bitterness are synonyms defined as:

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

thorniness (noun)	bitterness (noun)
the quality of being covered with prickly thorns or spines	the property of having a harsh unpleasant taste
a rough and bitter manner	a rough and bitter manner
The property of being full of difficulties, complexities, or controversial points.	the taste experience when quinine or coffee is taken into the mouth
	a feeling of deep and bitter anger and ill-will