sourness vs taste property

sourness and taste property both are nouns.

Word	Noun	Adjective	Verb	Adverb
sourness	Yes	No	No	No
taste property	Yes	No	No	No

As nouns, taste property is a hypernym of sourness; that is, taste property is a word with a broader meaning than sourness:

sourness (noun)	taste property (noun)
the property of being acidic	a property appreciated via the sense of taste
a sullen moody resentful disposition
the taste experience when vinegar or lemon juice is taken into the mouth