sponge — any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or framework, occurring in large, sessile colonies.
loofa — Also called dishcloth gourd, rag gourd. any of several tropical vines of the genus Luffa, of the gourd family, bearing large, elongated fruit. the fruit of such a vine.
