tart vs unpleasant

tart is a noun but unpleasant is not a noun.

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

tart (noun)	unpleasant (noun)
a small open pie with a fruit filling
a pastry cup with a filling of fruit or custard and no top crust
a woman who engages in sexual intercourse for money

tart (adjective)	unpleasant (adjective)
tasting sour like a lemon	offensive or disagreeable; causing discomfort or unhappiness
harsh