sourness vs taste perception

sourness and taste perception both are nouns.

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

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

sourness: the taste experience when vinegar or lemon juice is taken into the mouth
taste perception: the sensation that results when taste buds in the tongue and throat convey information about the chemical composition of a soluble stimulus

Other hypernyms of sourness include gustatory perception, gustatory sensation, taste, taste sensation.

sourness (noun)	taste perception (noun)
the property of being acidic	the sensation that results when taste buds in the tongue and throat convey information about the chemical composition of a soluble stimulus
a sullen moody resentful disposition
the taste experience when vinegar or lemon juice is taken into the mouth