SYN: Unit, atom, point, title, jot, item.
ANT: Numbers, quantity, bulk, gum, mass, collection, aggregate, total.
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KEY: Acerbity.
SYN: Harshness, acridity, tartness, acidity, bitterness, acrimony, crabbedness, moroseness, sourness, roughness.
ANT: Sweetness, mildness, softness, mellowness, gentleness, amiableness.
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KEY: Ache \n.\
SYN: Pain, suffering, smart, anguish, pang.
ANT: [See PAIN].