THESAURUS
acerb, acerbate, acerbic, acetic, acetose, acetous, acid, acidic, acidulated, acidulent, acrid, acrimonious, astringent, biting, bitter, burning, caustic, choleric, corroding, corrosive, cutting, double-edged, dry, edged, embittered, escharotic, fierce, harsh, hyperacid, incisive, keen, mordacious, mordant, penetrating, piercing, piquant, poignant, pungent, rancorous, rankled, resentful, resenting, rigorous, rough, scathing, scorching, severe, sharp, sore, splenetic, stabbing, stewing, stinging, strident, stringent, subacid, subacidulous, tart, trenchant, vehement, violent, virulent, vitriolic, withering
ROGET THESAURUS
Sourness
N
sourness, acid, acidity, low pH, acetous fermentation, lactic fermentation, vinegar, verjuice, crab, alum, acetic acid, lactic acid, sour, acid,
acidulous, acidulated, tart, crabbed, acetous, acetose, acerb, acetic, sour as vinegar, sourish, acescent, subacid, styptic, hard, rough, sour as a lemon, (4) Odor.