WordNet sense 1 (a woman who engages in sexual intercourse for money):

bawd, harlot, prostitute, cocotte, Cyprian, working girl, lady of pleasure, woman of the street, sporting lady, fancy woman

WordNet sense 2 (tasting sour like a lemon):

lemony, sourish, tangy, lemonlike

WordNet sense 3 (having a sharp biting taste):

sour

WordNet sense 4 (harsh):

sharp, sharp-worded

WordNet sense 5 (disagreeable to the senses, to the mind, or feelings ):

unpleasant