tartness vs tart

tartness and tart both are nouns.

Word	Noun	Adjective	Verb	Adverb
tartness	Yes	No	No	No
tart	Yes	Yes	No	No

tartness (noun)	tart (noun)
a sharp sour taste	a small open pie with a fruit filling
a rough and bitter manner	a pastry cup with a filling of fruit or custard and no top crust
the taste experience when vinegar or lemon juice is taken into the mouth	a woman who engages in sexual intercourse for money

tartness (adjective)	tart (adjective)
	tasting sour like a lemon
	harsh