Acidities refer to the level of acidic properties in a substance. Synonyms for acidities include sourness, bitterness, tartness, pungency, and astringency. Sourness describes the sharp or tangy taste that comes from acidic substances such as lemons or vinegar. Bitterness refers to a harsh or unpleasant taste caused by alkaline substances or bitter compounds. Tartness indicates a sharp acidic flavor, often found in fruits, such as green apples or berries. Pungency is a strong, hot, or spicy taste resulting from acids like capsaicin in chili peppers. Finally, astringency is a dry or puckering sensation resulting from tannins in tea or wine, adding acidity without actual sourness.