Spongeous is a word that describes a material or substance that has a spongy, porous texture. Synonyms for spongeous include porous, permeable, absorbent, spongelike, spongy, soft, flexible, and squishy. These words all describe materials that are capable of absorbing and holding liquids or gases. Spongeous materials are often used in applications such as sound dampening, insulation, and filtration. They can also be found in everyday products such as sponges, foam cushions, and mattress toppers. Whether it's a natural sponge from the ocean or a man-made foam product, spongeous materials have a variety of uses and play an important role in many industries.