bitterness vs disagreeableness

bitterness and disagreeableness both are nouns.

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

As nouns, disagreeableness is a hypernym of bitterness; that is, disagreeableness is a word with a broader meaning than bitterness:

bitterness (noun)	disagreeableness (noun)
the property of having a harsh unpleasant taste	an ill-tempered and offensive disposition
a rough and bitter manner	the quality of being disagreeable and unpleasant
the taste experience when quinine or coffee is taken into the mouth
a feeling of deep and bitter anger and ill-will