bitterness vs acrimony

bitterness and acrimony both are nouns.

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

As nouns, bitterness and acrimony are synonyms defined as:

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

bitterness (noun)	acrimony (noun)
the property of having a harsh unpleasant taste	a rough and bitter manner
a rough and bitter manner
the taste experience when quinine or coffee is taken into the mouth
a feeling of deep and bitter anger and ill-will