bitterness vs tartness

bitterness and tartness both are nouns.

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

As nouns, bitterness and tartness are synonyms defined as:

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

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