The term 'hard stuff' can refer to a variety of items, including the crossword solutions of CIDER (5 letters), SAUCE (5 letters), LIQUOR (6 letters), IRON (4 letters), CASH (4 letters), ROCK (4 letters), BOOZE (5 letters), STEEL (5 letters), NARCOTIC (8 letters), and PROOFSPIRIT (11 letters). CIDER is an alcoholic beverage made from fermented apples, while SAUCE is a liquid or semi-solid food served on or used in preparing other foods. LIQUOR is an alcoholic beverage distilled from grain, fruit, or vegetables, while IRON is a metallic element that is strong and malleable. CASH is money in the form of coins or banknotes, while ROCK is a naturally occurring solid aggregate of minerals or mineraloids. BOOZE is an informal term for an alcoholic beverage, while STEEL is an alloy of IRON and carbon. NARCOTIC is a drug that dulls the senses and relieves pain, while proofspirit is an alcoholic beverage with a high alcohol content.