tartness vs gustatory sensation

tartness and gustatory sensation both are nouns.

Word	Noun	Adjective	Verb	Adverb
tartness	Yes	No	No	No
gustatory sensation	Yes	No	No	No

As nouns, gustatory sensation is a hypernym of tartness; that is, gustatory sensation is a word with a broader meaning than tartness:

tartness: the taste experience when vinegar or lemon juice is taken into the mouth
gustatory sensation: 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 tartness include gustatory perception, taste, taste perception, taste sensation.

tartness (noun)	gustatory sensation (noun)
a sharp sour taste	the sensation that results when taste buds in the tongue and throat convey information about the chemical composition of a soluble stimulus
a rough and bitter manner
the taste experience when vinegar or lemon juice is taken into the mouth