tartness vs taste sensation

tartness and taste sensation both are nouns.

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

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

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

tartness (noun)	taste 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