The term 'OLD FLOOR NOISE' can be summarized by the crossword solution 'CREAK, ' which is a five-letter word. A CREAK is a high-pitched, squeaky sound that is often heard when walking on an old wooden floor. This noise is caused by the wood rubbing against itself or other objects, such as nails or screws. Creaking floors are a common problem in older homes and buildings, and can be a sign of structural damage.