A straw mat is often used as a summer sleeping mat or as a mat for meditation. However, if you are looking for synonyms for the word "straw mat," you might consider using the following: woven mat, rush mat, reed mat, grass mat, bamboo mat, tatami mat, or even a natural fiber woven mat. These are all excellent alternatives to a straw mat, as they provide the same comfortable, flat surface for sleeping or meditation while still keeping an organic feel. It's important to choose a mat that fits your individual needs and preferences, so experiment with different materials until you find the perfect fit!