acidity vs acidulousness

acidity and acidulousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
acidity	Yes	No	No	No
acidulousness	Yes	No	No	No

As nouns, acidity and acidulousness are synonyms defined as:

acidity and acidulousness: the taste experience when something acidic is taken into the mouth

acidity (noun)	acidulousness (noun)
pH values below 7	the taste experience when something acidic is taken into the mouth
the property of being acidic
the taste experience when something acidic is taken into the mouth